/****************************************************************************
*          PredictLib: A satellite tracking/orbital prediction library      *
*                      Copyright Andrew T. West, 2008                       *
*        Based on PREDICT, Copyright John A. Magliacane, KD2BD 1991-2002    *
*                         Last update: 07-Jun-2008                          *
*****************************************************************************
*                                                                           *
* This program is free software; you can redistribute it and/or modify it   *
* under the terms of the GNU General Public License as published by the     *
* Free Software Foundation; either version 2 of the License or any later    *
* version.                                                                  *
*                                                                           *
* This program is distributed in the hope that it will be useful,           *
* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
* General Public License for more details.                                  *
*                                                                           *
*****************************************************************************/

var PLib = 
	{
		deg2rad: 1.745329251994330E-2,
		pi: 3.14159265358979323846, pio2: 1.57079632679489656, twopi: 6.28318530717958623,
		e6a: 1.0E-6,
		tothrd: 6.6666666666666666E-1,
		xj3: -2.53881E-6, xke: 7.43669161E-2, xkmper: 6.378137E3, xmnpda: 1.44E3,
		ae: 1.0,
		ck2: 5.413079E-4, ck4: 6.209887E-7,
		f: 3.35281066474748E-3, s: 1.012229,
		qoms2t: 1.880279E-09,
		secday: 8.6400E4,
		omega_E: 1.00273790934,
		zns: 1.19459E-5, c1ss: 2.9864797E-6, zes: 1.675E-2, znl: 1.5835218E-4, c1l: 4.7968065E-7, zel: 5.490E-2,
		zcosis: 9.1744867E-1, zsinis: 3.9785416E-1, zsings: -9.8088458E-1, zcosgs: 1.945905E-1,
		q22: 1.7891679E-6, q31: 2.1460748E-6, q33: 2.2123015E-7,
		g22: 5.7686396, g32: 9.5240898E-1, g44: 1.8014998, g52: 1.0508330, g54: 4.4108898,
		root22: 1.7891679E-6, root32: 3.7393792E-7, root44: 7.3636953E-9, root52: 1.1428639E-7, root54: 2.1765803E-9,
		thdt: 4.3752691E-3,
		mfactor: 7.292115E-5,
		sr: 6.96000E5,
		AU: 1.49597870691E8,

		dpinit: 1, dpsec: 2, dpper: 3,

		ALL_FLAGS: -1,
		SGP4_INITIALIZED_FLAG: 0x000002,
		SDP4_INITIALIZED_FLAG: 0x000004,
		SIMPLE_FLAG: 0x000020,
		DEEP_SPACE_EPHEM_FLAG: 0x000040,
		LUNAR_TERMS_DONE_FLAG: 0x000080,
		DO_LOOP_FLAG: 0x000200,
		RESONANCE_FLAG: 0x000400,
		SYNCHRONOUS_FLAG: 0x000800,
		EPOCH_RESTART_FLAG: 0x001000,
		VISIBLE_FLAG: 0x002000,
		SAT_ECLIPSED_FLAG: 0x004000,

		sat_t: function()
			{
				this.line1 = "";
				this.line2 = "";
				this.name = "";
				this.catnum = 0;
				this.setnum = 0;
				this.designator = "";
				this.year = 0;
				this.refepoch = 0.0;
				this.incl = 0.0;
				this.raan = 0.0;
				this.eccn = 0.0;
				this.argper = 0.0;
				this.meanan = 0.0;
				this.meanmo = 0.0;
				this.drag = 0.0;
				this.nddot6 = 0.0;
				this.bstar = 0.0;
				this.orbitnum = 0.0;
				this.refepoch = 0;
			},

		sat: new Array(),

		qth:
			{
				callsign: "HOME",
				stnlat: 0.0,
				stnlong: 0.0,
				stnalt: 1000,
				utc_offset: new Date().getTimezoneOffset() / 60
			},

		tempstr: "", output: "",

		tsince: 0.0, jul_epoch: 0.0, jul_utc: 0.0, eclipse_depth: 0.0,
			sat_azi: 0.0, sat_ele: 0.0, sat_range: 0.0, sat_range_rate: 0.0,
			sat_lat: 0.0, sat_lon: 0.0, sat_alt: 0.0, sat_vel: 0.0, phase: 0.0,
			sun_azi: 0.0, sun_ele: 0.0, daynum: 0.0, fm: 0.0, fk: 0.0, age: 0.0, aostime: 0.0,
			lostime: 0.0, ax: 0.0, ay: 0.0, az: 0.0, rx: 0.0, ry: 0.0, rz: 0.0, squint: 0.0, alat: 0.0, alon: 0.0,

		ephem: "", sat_sun_status: "", findsun: "",

		indx: 0, iaz: 0, iel: 0, ma256: 0, isplat: 0, isplong: 0, Flags: 0,

		rv: 0, irk: 0,

		tle_t: function()
		{
			this.epoch = 0.0;
			this.xndt2o = 0.0;
			this.xndd6o = 0.0;
			this.bstar = 0.0;
			this.xincl = 0.0;
			this.xnodeo = 0.0;
			this.eo = 0.0;
			this.omegao = 0.0;
			this.xmo = 0.0;
			this.xno = 0.0;
			this.catnr = 0;
			this.elset = 0;
			this.revnum = 0;
			this.sat_name = "";
			this.idesg = "";
		},

		geodetic_t: function()
		{
			this.lat = 0.0;
			this.lon = 0.0;
			this.alt = 0.0;
			this.theta = 0.0;
		},

		vector_t: function()
		{
			this.x = 0.0;
			this.y = 0.0;
			this.z = 0.0;
			this.w = 0.0;
		},

		deep_arg_t: function()
		{
			this.eosq = 0.0;
			this.sinio = 0.0;
			this.cosio = 0.0;
			this.betao = 0.0;
			this.aodp = 0.0;
			this.theta2 = 0.0;
			this.sing = 0.0;
			this.cosg = 0.0;
			this.betao2 = 0.0;
			this.xmdot = 0.0;
			this.omgdot = 0.0;
			this.xnodot = 0.0;
			this.xnodp = 0.0;
			this.xll = 0.0;
			this.omgadf = 0.0;
			this.xnode = 0.0;
			this.em = 0.0;
			this.xinc = 0.0;
			this.xn = 0.0;
			this.t = 0.0;
			this.ds50 = 0.0;
		},

		obs_geodetic: new Object(),
		tle: new Object(),
		tleData: new Array(),

		isFlagSet: function(flag)
		{
			return (PLib.Flags & flag);
		},

		isFlagClear: function(flag)
		{
			return (~PLib.Flags & flag);
		},

		SetFlag: function(flag)
		{
			PLib.Flags |= flag;
		},

		ClearFlag: function (flag)
		{
			PLib.Flags &= ~flag;
		},

		Sqr: function(arg)
		{
			return (arg * arg);
		},

		Radians: function(arg)
		{
			return (arg * PLib.deg2rad);
		},

		Degrees: function(arg)
		{
			return (arg / PLib.deg2rad);
		},

		Magnitude: function(v)
		{
			v.w = Math.sqrt(PLib.Sqr(v.x) + PLib.Sqr(v.y) + PLib.Sqr(v.z));
		},

		Vec_Sub: function(v1, v2, v3)
		{
			v3.x = v1.x - v2.x;
			v3.y = v1.y - v2.y;
			v3.z = v1.z - v2.z;
			PLib.Magnitude(v3);
		},

		Scalar_Multiply: function(k, v1, v2)
		{
			v2.x = k * v1.x;
			v2.y = k * v1.y;
			v2.z = k * v1.z;
			v2.w = Math.abs(k) * v1.w;
		},

		Scale_Vector: function(k, v)
		{ 
			v.x *= k;
			v.y *= k;
			v.z *= k;
			PLib.Magnitude(v);
		},

		Dot: function(v1, v2)
		{
			return (v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
		},

		Angle: function(v1, v2)
		{
			PLib.Magnitude(v1);
			PLib.Magnitude(v2);
			return (Math.acos(PLib.Dot(v1, v2) / (v1.w * v2.w)));
		},

		FMod2p: function(x)
		{
			var i = 0;
			var ret_val = 0.0;

			ret_val = x;
			i = parseInt(ret_val / PLib.twopi);
			ret_val -= i * PLib.twopi;

			if (ret_val < 0.0)
				ret_val += PLib.twopi;

			return ret_val;
		},

		Modulus: function(arg1, arg2)
		{
			return arg1 - (parseInt(arg1 / arg2)) * arg2;
		},

		Frac: function(arg)
		{
			return(arg - Math.floor(arg));
		},

		Convert_Sat_State: function(pos, vel)
		{
			PLib.Scale_Vector(PLib.xkmper, pos);
			PLib.Scale_Vector(PLib.xkmper * PLib.xmnpda / PLib.secday, vel);
		},

		Julian_Date_of_Year: function(year)
		{
			var A = 0, B = 0, i = 0;
			var jdoy = 0.0;

			year = year - 1;
			i = parseInt(year / 100);
			A = i;
			i = parseInt(A / 4);
			B = 2 - A + i;
			i = parseInt(365.25 * year);
			i += parseInt(30.6001 * 14);
			jdoy = i + 1720994.5 + B;

			return jdoy;
		},

		Julian_Date_of_Epoch: function(epoch)
		{ 
			var year = 0.0, day = 0.0;
		
			year = parseInt(epoch * 1E-3);
			day = ((epoch * 1E-3) - year) * 1E3;
		
			if (year < 57)
				year = year + 2000;
			else
				year = year + 1900;
		
			return (PLib.Julian_Date_of_Year(year) + day);
		},

		Delta_ET: function(year)
		{
			var delta_et = 0.0;
		
			delta_et = 26.465 + 0.747622 * (year - 1950) + 1.886913 * Math.sin(PLib.twopi * (year - 1975) / 33);
		
			return delta_et;
		},

		ThetaG: function(epoch, deep_arg)
		{
			var year = 0.0, day = 0.0, UT = 0.0, jd = 0.0, TU = 0.0, GMST = 0.0, ThetaG = 0.0;
		
			year = parseInt(epoch * 1E-3);
			day = ((epoch * 1E-3) - year) * 1E3;
		
			if (year < 57)
				year += 2000;
			else
				year += 1900;
		
			UT = (day - parseInt(day));
			day = parseInt(day);
			jd = PLib.Julian_Date_of_Year(year) + day;
			TU = (jd - 2451545.0) / 36525;
			GMST = 24110.54841 + TU * (8640184.812866 + TU * (0.093104 - TU * 6.2E-6));
			GMST = PLib.Modulus(GMST + PLib.secday * PLib.omega_E * UT, PLib.secday);
			ThetaG = twopi * GMST / PLib.secday;
			deep_arg.ds50 = jd - 2433281.5 + UT;
			ThetaG = PLib.FMod2p(6.3003880987 * deep_arg.ds50 + 1.72944494);
		
			return ThetaG;
		},

		ThetaG_JD: function(jd)
		{
			var UT = 0.0, TU = 0.0, GMST = 0.0;

			UT = PLib.Frac(jd + 0.5);
			jd = jd - UT;
			TU = (jd - 2451545.0) / 36525;
			GMST = 24110.54841 + TU * (8640184.812866 + TU * (0.093104 - TU * 6.2E-6));
			GMST = PLib.Modulus(GMST + PLib.secday * PLib.omega_E * UT, PLib.secday);

			return (PLib.twopi * GMST / PLib.secday);
		},

		Calculate_Solar_Position: function(time, solar_vector)
		{
			var mjd = 0.0, year = 0.0, T = 0.0, M = 0.0, L = 0.0, e = 0.0, C = 0.0, O = 0.0, Lsa = 0.0, nu = 0.0, R = 0.0, eps = 0.0;

			mjd  =  time - 2415020.0;
			year  =  1900  +  mjd / 365.25;
			T = (mjd + PLib.Delta_ET(year) / PLib.secday) / 36525.0;
			M = PLib.Radians(PLib.Modulus(358.47583 + PLib.Modulus(35999.04975 * T, 360.0) - (0.000150 + 0.0000033 * T) * PLib.Sqr(T), 360.0));
			L = PLib.Radians(PLib.Modulus(279.69668 + PLib.Modulus(36000.76892 * T, 360.0) + 0.0003025 * PLib.Sqr(T),360.0));
			e = 0.01675104 - (0.0000418 + 0.000000126 * T) * T;
			C = PLib.Radians((1.919460 - (0.004789 + 0.000014 * T) * T) * Math.sin(M) + (0.020094 - 0.000100 * T) * Math.sin(2 * M) + 0.000293 * Math.sin(3 * M));
			O = PLib.Radians(PLib.Modulus(259.18-1934.142 * T, 360.0));
			Lsa = PLib.Modulus(L + C - PLib.Radians(0.00569-0.00479 * Math.sin(O)), PLib.twopi);
			nu = PLib.Modulus(M + C, PLib.twopi);
			R = 1.0000002 * (1.0 - PLib.Sqr(e)) / (1.0 + e * Math.cos(nu));
			eps = PLib.Radians(23.452294 - (0.0130125 + (0.00000164 - 0.000000503 * T) * T) * T + 0.00256 * Math.cos(O));
			R = PLib.AU * R;
			solar_vector.x = R * Math.cos(Lsa);
			solar_vector.y = R * Math.sin(Lsa) * Math.cos(eps);
			solar_vector.z = R * Math.sin(Lsa) * Math.sin(eps);
			solar_vector.w = R;
		},

		Sat_Eclipsed: function(pos, sol)
		{
			var sd_sun = 0.0, sd_earth = 0.0, delta = 0.0;
			var Rho = new PLib.vector_t();
			var earth = new PLib.vector_t();;

			sd_earth = Math.asin(PLib.xkmper / pos.w);
			PLib.Vec_Sub(sol, pos, Rho);
			sd_sun = Math.asin(PLib.sr / Rho.w);
			PLib.Scalar_Multiply(-1, pos, earth);
			delta = PLib.Angle(sol, earth);
			PLib.eclipse_depth = sd_earth - sd_sun - delta;

			if (sd_earth < sd_sun)
				return 0;
			else
				if (PLib.eclipse_depth >= 0)
					return 1;
			else
				return 0;
		},

		select_ephemeris: function(tle)
		{
			var ao = 0.0, xnodp = 0.0, dd1 = 0.0, dd2 = 0.0, delo = 0.0, temp = 0.0, a1 = 0.0, del1 = 0.0, r1 = 0.0;

			tle.xnodeo *= PLib.deg2rad;
			tle.omegao *= PLib.deg2rad;
			tle.xmo *= PLib.deg2rad;
			tle.xincl *= PLib.deg2rad;
			temp = PLib.twopi / PLib.xmnpda / PLib.xmnpda;
			tle.xno = tle.xno * temp * PLib.xmnpda;
			tle.xndt2o *= temp;
			tle.xndd6o = tle.xndd6o * temp / PLib.xmnpda;
			tle.bstar /= PLib.ae;

			dd1 = (PLib.xke / tle.xno);
			dd2 = PLib.tothrd;
			a1 = Math.pow(dd1, dd2);
			r1 = Math.cos(tle.xincl);
			dd1 = (1.0 - tle.eo * tle.eo);
			temp = PLib.ck2 * 1.5 * (r1 * r1 * 3.0 - 1.0) / Math.pow(dd1, 1.5);
			del1 = temp / (a1 * a1);
			ao = a1 * (1.0 - del1 * (PLib.tothrd * 0.5 + del1 * (del1 * 1.654320987654321 + 1.0)));
			delo = temp / (ao * ao);
			xnodp = tle.xno / (delo + 1.0);

			if (PLib.twopi / PLib.xnodp / PLib.xmnpda >= 0.15625)
				PLib.SetFlag(PLib.DEEP_SPACE_EPHEM_FLAG);
			else
				PLib.ClearFlag(PLib.DEEP_SPACE_EPHEM_FLAG);
		},

		SGP4: function(tsince, tle, pos, vel)
		{
			var cosuk = 0.0, sinuk = 0.0, rfdotk = 0.0, vx = 0.0, vy = 0.0, vz = 0.0, ux = 0.0, uy = 0.0, uz = 0.0, xmy = 0.0, xmx = 0.0, cosnok = 0.0,
				sinnok = 0.0, cosik = 0.0, sinik = 0.0, rdotk = 0.0, xinck = 0.0, xnodek = 0.0, uk = 0.0, rk = 0.0, cos2u = 0.0, sin2u = 0.0,
				u = 0.0, sinu = 0.0, cosu = 0.0, betal = 0.0, rfdot = 0.0, rdot = 0.0, r = 0.0, pl = 0.0, elsq = 0.0, esine = 0.0, ecose = 0.0, epw = 0.0,
				cosepw = 0.0, x1m5th = 0.0, xhdot1 = 0.0, tfour = 0.0, sinepw = 0.0, capu = 0.0, ayn = 0.0, xlt = 0.0, aynl = 0.0, xll = 0.0,
				axn = 0.0, xn = 0.0, beta = 0.0, xl = 0.0, e = 0.0, a = 0.0, tcube = 0.0, delm = 0.0, delomg = 0.0, templ = 0.0, tempe = 0.0, tempa = 0.0,
				xnode = 0.0, tsq = 0.0, xmp = 0.0, omega = 0.0, xnoddf = 0.0, omgadf = 0.0, xmdf = 0.0, a1 = 0.0, a3ovk2 = 0.0, ao = 0.0,
				betao = 0.0, betao2 = 0.0, c1sq = 0.0, c2 = 0.0, c3 = 0.0, coef = 0.0, coef1 = 0.0, del1 = 0.0, delo = 0.0, eeta = 0.0, eosq = 0.0,
				etasq = 0.0, perigee = 0.0, pinvsq = 0.0, psisq = 0.0, qoms24 = 0.0, s4 = 0.0, temp = 0.0, temp1 = 0.0, temp2 = 0.0,
				temp3 = 0.0, temp4 = 0.0, temp5 = 0.0, temp6 = 0.0, theta2 = 0.0, theta4 = 0.0, tsi = 0.0;

			var i = 0;

			if (PLib.isFlagClear(PLib.SGP4_INITIALIZED_FLAG))
			{
				PLib.SetFlag(PLib.SGP4_INITIALIZED_FLAG);

				a1 = Math.pow(PLib.xke / tle.xno, PLib.tothrd);
				PLib.SGP4.cosio = Math.cos(tle.xincl);
				theta2 = PLib.SGP4.cosio * PLib.SGP4.cosio;
				PLib.SGP4.x3thm1 = 3 * theta2 - 1.0;
				eosq = tle.eo * tle.eo;
				betao2 = 1.0 - eosq;
				betao = Math.sqrt(betao2);
				del1 = 1.5 * PLib.ck2 * PLib.SGP4.x3thm1 / (a1 * a1 * betao * betao2);
				ao = a1 * (1.0 - del1 * (0.5 * PLib.tothrd + del1 * (1.0 + 134.0 / 81.0 * del1)));
				delo = 1.5 * PLib.ck2 * PLib.SGP4.x3thm1 / (ao * ao * betao * betao2);
				PLib.SGP4.xnodp = tle.xno / (1.0 + delo);
				PLib.SGP4.aodp = ao / (1.0 - delo);

				if ((PLib.SGP4.aodp * (1 - tle.eo) / PLib.ae) < (220 / PLib.xkmper + PLib.ae))
				    PLib.SetFlag(PLib.SIMPLE_FLAG);
				else
				    PLib.ClearFlag(PLib.SIMPLE_FLAG);

				s4 = PLib.s;
				PLib.qoms24 = PLib.qoms2t;
				PLib.perigee = (PLib.SGP4.aodp * (1 - tle.eo) - PLib.ae) * PLib.xkmper;

				if (PLib.perigee < 156.0)
				{
					if (PLib.perigee <= 98.0)
						s4 = 20;
					else
						s4 = PLib.perigee - 78.0;

					PLib.qoms24 = Math.pow((120 - s4) * PLib.ae / PLib.xkmper, 4);
					s4 = s4 / PLib.xkmper + PLib.ae;
				}

				pinvsq = 1 / (PLib.SGP4.aodp * PLib.SGP4.aodp * betao2 * betao2);
				tsi = 1 / (PLib.SGP4.aodp - s4);
				PLib.SGP4.eta = PLib.SGP4.aodp * tle.eo * tsi;
				etasq = PLib.SGP4.eta * PLib.SGP4.eta;
				eeta = tle.eo * PLib.SGP4.eta;
				psisq = Math.abs(1 - etasq);
				coef = qoms24 * Math.pow(tsi, 4);
				coef1 = coef / Math.pow(psisq, 3.5);
				c2 = coef1 * PLib.SGP4.xnodp * (PLib.SGP4.aodp * (1 + 1.5 * etasq + eeta * (4 + etasq)) + 0.75 * PLib.ck2 * tsi / psisq * PLib.SGP4.x3thm1 * (8 + 3 * etasq * (8 + etasq)));
				PLib.SGP4.c1 = tle.bstar * c2;
				PLib.SGP4.sinio = Math.sin(tle.xincl);
				a3ovk2 = -PLib.xj3 / PLib.ck2 * Math.pow(PLib.ae, 3);
				c3 = coef * tsi * a3ovk2 * PLib.SGP4.xnodp * PLib.ae * PLib.SGP4.sinio / tle.eo;
				PLib.SGP4.x1mth2 = 1 - theta2;

				PLib.SGP4.c4 = 2 * PLib.SGP4.xnodp * coef1 * PLib.SGP4.aodp * betao2 * (PLib.SGP4.eta * (2 + 0.5 * etasq)+tle.eo * (0.5 + 2 * etasq) - 2 * PLib.ck2 * tsi / (PLib.SGP4.aodp * psisq) * (-3 * PLib.SGP4.x3thm1 * (1 - 2 * eeta + etasq * (1.5 - 0.5 * eeta)) + 0.75 * PLib.SGP4.x1mth2 * (2 * etasq-eeta * (1 + etasq)) * Math.cos(2 * tle.omegao)));
				PLib.SGP4.c5 = 2 * coef1 * PLib.SGP4.aodp * betao2 * (1 + 2.75 * (etasq + eeta) + eeta * etasq);

				theta4 = theta2 * theta2;
				temp1 = 3 * PLib.ck2 * pinvsq * PLib.SGP4.xnodp;
				temp2 = temp1 * PLib.ck2 * pinvsq;
				temp3 = 1.25 * PLib.ck4 * pinvsq * pinvsq * PLib.SGP4.xnodp;
				PLib.SGP4.xmdot = PLib.SGP4.xnodp + 0.5 * temp1 * betao * PLib.SGP4.x3thm1 + 0.0625 * temp2 * betao * (13 - 78 * theta2 + 137 * theta4);
				x1m5th = 1 - 5 * theta2;
				PLib.SGP4.omgdot = -0.5 * temp1 * x1m5th + 0.0625 * temp2 * (7 - 114 * theta2 + 395 * theta4) + temp3 * (3 - 36 * theta2 + 49 * theta4);
				xhdot1 = -temp1 * PLib.SGP4.cosio;
				PLib.SGP4.xnodot = xhdot1 + (0.5 * temp2 * (4 - 19 * theta2) + 2 * temp3 * (3 - 7 * theta2)) * PLib.SGP4.cosio;
				PLib.SGP4.omgcof = tle.bstar * c3 * Math.cos(tle.omegao);
				PLib.SGP4.xmcof = -PLib.tothrd * coef * tle.bstar * PLib.ae / eeta;
				PLib.SGP4.xnodcf = 3.5 * betao2 * xhdot1 * PLib.SGP4.c1;
				PLib.SGP4.t2cof = 1.5 * PLib.SGP4.c1;
				PLib.SGP4.xlcof = 0.125 * a3ovk2 * PLib.SGP4.sinio * (3 + 5 * PLib.SGP4.cosio) / (1 + PLib.SGP4.cosio);
				PLib.SGP4.aycof = 0.25 * a3ovk2 * PLib.SGP4.sinio;
				PLib.SGP4.delmo = Math.pow(1 + PLib.SGP4.eta * Math.cos(tle.xmo), 3);
				PLib.SGP4.sinmo = Math.sin(tle.xmo);
				PLib.SGP4.x7thm1 = 7 * theta2 - 1;

				if (PLib.isFlagClear(PLib.SIMPLE_FLAG))
				{
					c1sq = PLib.SGP4.c1 * PLib.SGP4.c1;
					PLib.SGP4.d2 = 4 * PLib.SGP4.aodp * tsi * c1sq;
					temp = PLib.SGP4.d2 * tsi * PLib.SGP4.c1/3;
					PLib.SGP4.d3 = (17 * PLib.SGP4.aodp + s4) * temp;
					PLib.SGP4.d4 = 0.5 * temp * PLib.SGP4.aodp * tsi * (221 * PLib.SGP4.aodp + 31 * s4) * PLib.SGP4.c1;
					PLib.SGP4.t3cof = PLib.SGP4.d2 + 2 * c1sq;
					PLib.SGP4.t4cof = 0.25 * (3 * PLib.SGP4.d3 + PLib.SGP4.c1 * (12 * PLib.SGP4.d2 + 10 * c1sq));
					PLib.SGP4.t5cof = 0.2 * (3 * PLib.SGP4.d4 + 12 * PLib.SGP4.c1 * PLib.SGP4.d3 + 6 * PLib.SGP4.d2 * PLib.SGP4.d2 + 15 * c1sq * (2 * PLib.SGP4.d2 + c1sq));
				}
			}

			xmdf = tle.xmo + PLib.SGP4.xmdot * tsince;
			omgadf = tle.omegao + PLib.SGP4.omgdot * tsince;
			xnoddf = tle.xnodeo + PLib.SGP4.xnodot * tsince;
			omega = omgadf;
			xmp = xmdf;
			tsq = tsince * tsince;
			xnode = xnoddf + PLib.SGP4.xnodcf * tsq;
			tempa = 1 - PLib.SGP4.c1 * tsince;
			tempe = tle.bstar * PLib.SGP4.c4 * tsince;
			templ = PLib.SGP4.t2cof * tsq;

			if (PLib.isFlagClear(PLib.SIMPLE_FLAG))
			{
				delomg = PLib.SGP4.omgcof * tsince;
				delm = PLib.SGP4.xmcof * (Math.pow(1 + PLib.SGP4.eta * Math.cos(xmdf), 3) - PLib.SGP4.delmo);
				temp = delomg + delm;
				xmp = xmdf + temp;
				omega = omgadf - temp;
				tcube = tsq * tsince;
				tfour = tsince * tcube;
				tempa = tempa - PLib.SGP4.d2 * tsq - PLib.SGP4.d3 * tcube - PLib.SGP4.d4 * tfour;
				tempe = tempe + tle.bstar * PLib.SGP4.c5 * (Math.sin(xmp) - PLib.SGP4.sinmo);
				templ = templ + PLib.SGP4.t3cof * tcube + tfour * (PLib.SGP4.t4cof + tsince * PLib.SGP4.t5cof);
			}

			a = PLib.SGP4.aodp * Math.pow(tempa, 2);
			e = tle.eo - tempe;
			xl = xmp + omega + xnode + PLib.SGP4.xnodp * templ;
			beta = Math.sqrt(1 - e * e);
			xn = PLib.xke / Math.pow(a, 1.5);

			axn = e * Math.cos(omega);
			temp = 1 / (a * beta * beta);
			xll = temp * PLib.SGP4.xlcof * axn;
			aynl = temp * PLib.SGP4.aycof;
			xlt = xl + xll;
			ayn = e * Math.sin(omega) + aynl;

			capu = PLib.FMod2p(xlt - xnode);
			temp2 = capu;
			i = 0;

			do
			{
				sinepw = Math.sin(temp2);
				cosepw = Math.cos(temp2);
				temp3 = axn * sinepw;
				temp4 = ayn * cosepw;
				temp5 = axn * cosepw;
				temp6 = ayn * sinepw;
				epw = (capu - temp4 + temp3 - temp2) / (1 - temp5 - temp6) + temp2;

				if (Math.abs(epw - temp2) <= PLib.e6a)
					break;

				temp2 = epw;
			} while (i++ < 10);

			ecose = temp5 + temp6;
			esine = temp3 - temp4;
			elsq = axn * axn + ayn * ayn;
			temp = 1 - elsq;
			pl = a * temp;
			r = a * (1 - ecose);
			temp1 = 1 / r;
			rdot = PLib.xke * Math.sqrt(a) * esine * temp1;
			rfdot = PLib.xke * Math.sqrt(pl) * temp1;
			temp2 = a * temp1;
			betal = Math.sqrt(temp);
			temp3 = 1 / (1 + betal);
			cosu = temp2 * (cosepw - axn + ayn * esine * temp3);
			sinu = temp2 * (sinepw - ayn - axn * esine * temp3);
			u = Math.atan2(sinu, cosu);
			sin2u = 2 * sinu * cosu;
			cos2u = 2 * cosu * cosu - 1;
			temp = 1 / pl;
			temp1 = PLib.ck2 * temp;
			temp2 = temp1 * temp;

			rk = r * (1 - 1.5 * temp2 * betal * PLib.SGP4.x3thm1) + 0.5 * temp1 * PLib.SGP4.x1mth2 * cos2u;
			uk = u - 0.25 * temp2 * PLib.SGP4.x7thm1 * sin2u;
			xnodek = xnode + 1.5 * temp2 * PLib.SGP4.cosio * sin2u;
			xinck = tle.xincl + 1.5 * temp2 * PLib.SGP4.cosio * PLib.SGP4.sinio * cos2u;
			rdotk = rdot - xn * temp1 * PLib.SGP4.x1mth2 * sin2u;
			rfdotk = rfdot + xn * temp1 * (PLib.SGP4.x1mth2 * cos2u + 1.5 * PLib.SGP4.x3thm1);

			sinuk = Math.sin(uk);
			cosuk = Math.cos(uk);
			sinik = Math.sin(xinck);
			cosik = Math.cos(xinck);
			sinnok = Math.sin(xnodek);
			cosnok = Math.cos(xnodek);
			xmx = -sinnok * cosik;
			xmy = cosnok * cosik;
			ux = xmx * sinuk+cosnok * cosuk;
			uy = xmy * sinuk+sinnok * cosuk;
			uz = sinik * sinuk;
			vx = xmx * cosuk-cosnok * sinuk;
			vy = xmy * cosuk-sinnok * sinuk;
			vz = sinik * cosuk;

			pos.x = rk * ux;
			pos.y = rk * uy;
			pos.z = rk * uz;
			vel.x = rdotk * ux + rfdotk * vx;
			vel.y = rdotk * uy + rfdotk * vy;
			vel.z = rdotk * uz + rfdotk * vz;

			PLib.phase = xlt - xnode - omgadf + PLib.twopi;

			if (PLib.phase < 0.0)
				PLib.phase += PLib.twopi;

			PLib.phase = PLib.FMod2p(PLib.phase);
		},

		Deep: function(ientry, tle, deep_arg)
		{
			var a1 = 0.0, a2 = 0.0, a3 = 0.0, a4 = 0.0, a5 = 0.0, a6 = 0.0, a7 = 0.0, a8 = 0.0, a9 = 0.0, a10 = 0.0, ainv2 = 0.0, alfdp = 0.0, aqnv = 0.0,
				sgh = 0.0, sini2 = 0.0, sinis = 0.0, sinok = 0.0, sh = 0.0, si = 0.0, sil = 0.0, day = 0.0, betdp = 0.0, dalf = 0.0, bfact = 0.0, c = 0.0,
				cc = 0.0, cosis = 0.0, cosok = 0.0, cosq = 0.0, ctem = 0.0, f322 = 0.0, zx = 0.0, zy = 0.0, dbet = 0.0, dls = 0.0, eoc = 0.0, eq = 0.0, f2 = 0.0,
				f220 = 0.0, f221 = 0.0, f3 = 0.0, f311 = 0.0, f321 = 0.0, xnoh = 0.0, f330 = 0.0, f441 = 0.0, f442 = 0.0, f522 = 0.0, f523 = 0.0,
				f542 = 0.0, f543 = 0.0, g200 = 0.0, g201 = 0.0, g211 = 0.0, pgh = 0.0, ph = 0.0, s1 = 0.0, s2 = 0.0, s3 = 0.0, s4 = 0.0, s5 = 0.0, s6 = 0.0, s7 = 0.0,
				se = 0.0, sel = 0.0, ses = 0.0, xls = 0.0, g300 = 0.0, g310 = 0.0, g322 = 0.0, g410 = 0.0, g422 = 0.0, g520 = 0.0, g521 = 0.0, g532 = 0.0,
				g533 = 0.0, gam = 0.0, sinq = 0.0, sinzf = 0.0, sis = 0.0, sl = 0.0, sll = 0.0, sls = 0.0, stem = 0.0, temp = 0.0, temp1 = 0.0, x1 = 0.0,
				x2 = 0.0, x2li = 0.0, x2omi = 0.0, x3 = 0.0, x4 = 0.0, x5 = 0.0, x6 = 0.0, x7 = 0.0, x8 = 0.0, xl = 0.0, xldot = 0.0, xmao = 0.0, xnddt = 0.0,
				xndot = 0.0, xno2 = 0.0, xnodce = 0.0, xnoi = 0.0, xomi = 0.0, xpidot = 0.0, z1 = 0.0, z11 = 0.0, z12 = 0.0, z13 = 0.0, z2 = 0.0,
				z21 = 0.0, z22 = 0.0, z23 = 0.0, z3 = 0.0, z31 = 0.0, z32 = 0.0, z33 = 0.0, ze = 0.0, zf = 0.0, zm = 0.0, zmo = 0.0, zn = 0.0, zsing = 0.0,
				zsinh = 0.0, zsini = 0.0, zcosg = 0.0, zcosh = 0.0, zcosi = 0.0, delt = 0.0, ft = 0.0;
		
			switch (ientry)
			{
				case dpinit:
				PLib.Deep.thgr = PLib.ThetaG(tle.epoch, deep_arg);
				eq = tle.eo;
				PLib.Deep.xnq = deep_arg.xnodp;
				aqnv = 1 / deep_arg.aodp;
				PLib.Deep.xqncl = tle.xincl;
				xmao = tle.xmo;
				xpidot = deep_arg.omgdot + deep_arg.xnodot;
				sinq = Math.sin(tle.xnodeo);
				cosq = Math.cos(tle.xnodeo);
				PLib.Deep.omegaq = tle.omegao;
		
				day = deep_arg.ds50 + 18261.5;
		
				if (day != PLib.Deep.preep)
				{
					PLib.Deep.preep = day;
					xnodce = 4.5236020 - 9.2422029E-4 * day;
					stem = Math.sin(xnodce);
					ctem = Math.cos(xnodce);
					PLib.Deep.zcosil = 0.91375164 - 0.03568096 * ctem;
					PLib.Deep.zsinil = Math.sqrt(1 - PLib.Deep.zcosil * PLib.Deep.zcosil);
					PLib.Deep.zsinhl = 0.089683511 * stem / PLib.Deep.zsinil;
					PLib.Deep.zcoshl = Math.sqrt(1 - PLib.Deep.zsinhl * PLib.Deep.zsinhl);
					c = 4.7199672 + 0.22997150 * day;
					gam = 5.8351514 + 0.0019443680 * day;
					PLib.Deep.zmol = PLib.FMod2p(c - gam);
					zx = 0.39785416 * stem / PLib.Deep.zsinil;
					zy = PLib.Deep.zcoshl * ctem + 0.91744867 * PLib.Deep.zsinhl * stem;
					zx = Math.atan2(zx, zy);
					zx = gam + zx - xnodce;
					PLib.Deep.zcosgl = Math.cos(zx);
					PLib.Deep.zsingl = Math.sin(zx);
					PLib.Deep.zmos = 6.2565837 + 0.017201977 * day;
					PLib.Deep.zmos = PLib.FMod2p(PLib.Deep.zmos);
				    }
		
				  PLib.Deep.savtsn = 1E20;
				  zcosg = PLib.zcosgs;
				  zsing = PLib.zsings;
				  zcosi = PLib.zcosis;
				  zsini = PLib.zsinis;
				  zcosh = cosq;
				  zsinh = sinq;
				  cc = PLib.c1ss;
				  zn = PLib.zns;
				  ze = PLib.zes;
				  zmo = PLib.Deep.zmos;
				  xnoi = 1 / PLib.Deep.xnq;
		
				for (;;)
				{
					a1 = zcosg * zcosh + zsing * zcosi * zsinh;
					a3 = -zsing * zcosh + zcosg * zcosi * zsinh;
					a7 = -zcosg * zsinh + zsing * zcosi * zcosh;
					a8 = zsing * zsini;
					a9 = zsing * zsinh + zcosg * zcosi * zcosh;
					a10 = zcosg * zsini;
					a2 = deep_arg.cosio * a7 + deep_arg.sinio * a8;
					a4 = deep_arg.cosio * a9 + deep_arg.sinio * a10;
					a5 = -deep_arg.sinio * a7 + deep_arg.cosio * a8;
					a6 = -deep_arg.sinio * a9 + deep_arg.cosio * a10;
					x1 = a1 * deep_arg.cosg + a2 * deep_arg.sing;
					x2 = a3 * deep_arg.cosg + a4 * deep_arg.sing;
					x3 = -a1 * deep_arg.sing + a2 * deep_arg.cosg;
					x4 = -a3 * deep_arg.sing + a4 * deep_arg.cosg;
					x5 = a5 * deep_arg.sing;
					x6 = a6 * deep_arg.sing;
					x7 = a5 * deep_arg.cosg;
					x8 = a6 * deep_arg.cosg;
					z31 = 12 * x1 * x1 - 3 * x3 * x3;
					z32 = 24 * x1 * x2 - 6 * x3 * x4;
					z33 = 12 * x2 * x2 - 3 * x4 * x4;
					z1 = 3 * (a1 * a1 + a2 * a2) + z31 * deep_arg.eosq;
					z2 = 6 * (a1 * a3 + a2 * a4) + z32 * deep_arg.eosq;
					z3 = 3 * (a3 * a3 + a4 * a4) + z33 * deep_arg.eosq;
					z11 = -6 * a1 * a5 + deep_arg.eosq * (-24 * x1 * x7 - 6 * x3 * x5);
					z12 = -6 * (a1 * a6 + a3 * a5) + deep_arg.eosq * (-24 * (x2 * x7 + x1 * x8) - 6 * (x3 * x6 + x4 * x5));
					z13 = -6 * a3 * a6 + deep_arg.eosq * (-24 * x2 * x8 - 6 * x4 * x6);
					z21 = 6 * a2 * a5 + deep_arg.eosq * (24 * x1 * x5 - 6 * x3 * x7);
					z22 = 6 * (a4 * a5 + a2 * a6) + deep_arg.eosq * (24 * (x2 * x5 + x1 * x6) - 6 * (x4 * x7 + x3 * x8));
					z23 = 6 * a4 * a6 + deep_arg.eosq * (24 * x2 * x6 - 6 * x4 * x8);
					z1 = z1 + z1 + deep_arg.betao2 * z31;
					z2 = z2 + z2 + deep_arg.betao2 * z32;
					z3 = z3 + z3 + deep_arg.betao2 * z33;
					s3 = cc * xnoi;
					s2 = -0.5 * s3 / deep_arg.betao;
					s4 = s3 * deep_arg.betao;
					s1 = -15 * eq * s4;
					s5 = x1 * x3 + x2 * x4;
					s6 = x2 * x3 + x1 * x4;
					s7 = x2 * x4 - x1 * x3;
					se = s1 * zn * s5;
					si = s2 * zn * (z11 + z13);
					sl = -zn * s3 * (z1 + z3 - 14 - 6 * deep_arg.eosq);
					sgh = s4 * zn * (z31 + z33 - 6);
					sh = -zn * s2 * (z21 + z23);
		
					if (PLib.Deep.xqncl < 5.2359877E-2)
						sh = 0;
		
					PLib.Deep.ee2 = 2 * s1 * s6;
					PLib.Deep.e3 = 2 * s1 * s7;
					PLib.Deep.xi2 = 2 * s2 * z12;
					PLib.Deep.xi3 = 2 * s2 * (z13 - z11);
					PLib.Deep.xl2 = -2 * s3 * z2;
					PLib.Deep.xl3 = -2 * s3 * (z3 - z1);
					PLib.Deep.xl4 = -2 * s3 * (-21 - 9 * deep_arg.eosq) * ze;
					PLib.Deep.xgh2 = 2 * s4 * z32;
					PLib.Deep.xgh3 = 2 * s4 * (z33 - z31);
					PLib.Deep.xgh4 = -18 * s4 * ze;
					PLib.Deep.xh2 = -2 * s2 * z22;
					PLib.Deep.xh3 = -2 * s2  * (z23 - z21);
		
					if (PLib.isFlagSet(PLib.LUNAR_TERMS_DONE_FLAG))
						break;
		
					PLib.Deep.sse = se;
					PLib.Deep.ssi = si;
					PLib.Deep.ssl = sl;
					PLib.Deep.ssh = sh / deep_arg.sinio;
					PLib.Deep.ssg = sgh - deep_arg.cosio * PLib.Deep.ssh;
					PLib.Deep.se2 = PLib.Deep.ee2;
					PLib.Deep.si2 = PLib.Deep.xi2;
					PLib.Deep.sl2 = PLib.Deep.xl2;
					PLib.Deep.sgh2 = PLib.Deep.xgh2;
					PLib.Deep.sh2 = PLib.Deep.xh2;
					PLib.Deep.se3 = PLib.Deep.e3;
					PLib.Deep.si3 = PLib.Deep.xi3;
					PLib.Deep.sl3 = PLib.Deep.xl3;
					PLib.Deep.sgh3 = PLib.Deep.xgh3;
					PLib.Deep.sh3 = PLib.Deep.xh3;
					PLib.Deep.sl4 = PLib.Deep.xl4;
					PLib.Deep.sgh4 = PLib.Deep.xgh4;
					zcosg = PLib.Deep.zcosgl;
					zsing = PLib.Deep.zsingl;
					zcosi = PLib.Deep.zcosil;
					zsini = PLib.Deep.zsinil;
					zcosh = PLib.Deep.zcoshl * cosq + PLib.Deep.zsinhl * sinq;
					zsinh = sinq * PLib.Deep.zcoshl - cosq * PLib.Deep.zsinhl;
					zn = PLib.znl;
					cc = PLib.c1l;
					ze = PLib.zel;
					zmo = PLib.Deep.zmol;
					PLib.SetFlag(PLib.LUNAR_TERMS_DONE_FLAG);
				}
		
				PLib.Deep.sse = PLib.Deep.sse + se;
				PLib.Deep.ssi = PLib.Deep.ssi + si;
				PLib.Deep.ssl = PLib.Deep.ssl + sl;
				PLib.Deep.ssg = PLib.Deep.ssg + sgh - deep_arg.cosio / deep_arg.sinio * sh;
				PLib.Deep.ssh = PLib.Deep.ssh + sh / deep_arg.sinio;
		
				PLib.ClearFlag(PLib.RESONANCE_FLAG);
				PLib.ClearFlag(PLib.SYNCHRONOUS_FLAG);
		
				if (!((PLib.Deep.xnq < 0.0052359877) && (PLib.Deep.xnq > 0.0034906585)))
				{
					if ((PLib.Deep.xnq < 0.00826) || (PLib.Deep.xnq > 0.00924))
					    return;
		
					if (eq < 0.5)
					    return;
		
					PLib.SetFlag(PLib.RESONANCE_FLAG);
					eoc = eq * deep_arg.eosq;
					g201 = -0.306 - (eq - 0.64) * 0.440;
		
					if (eq <= 0.65)
					{
						g211 = 3.616 - 13.247 * eq + 16.290 * deep_arg.eosq;
						g310 = -19.302 + 117.390 * eq - 228.419 * deep_arg.eosq + 156.591 * eoc;
						g322 = -18.9068 + 109.7927 * eq - 214.6334 * deep_arg.eosq + 146.5816 * eoc;
						g410 = -41.122 + 242.694 * eq - 471.094 * deep_arg.eosq + 313.953 * eoc;
						g422 = -146.407 + 841.880 * eq - 1629.014 * deep_arg.eosq + 1083.435 * eoc;
						g520 = -532.114 + 3017.977 * eq - 5740 * deep_arg.eosq + 3708.276 * eoc;
					}
		
					else
					{
						g211 = -72.099 + 331.819 * eq - 508.738 * deep_arg.eosq + 266.724 * eoc;
						g310 = -346.844 + 1582.851 * eq - 2415.925 * deep_arg.eosq + 1246.113 * eoc;
						g322 = -342.585 + 1554.908 * eq - 2366.899 * deep_arg.eosq + 1215.972 * eoc;
						g410 = -1052.797 + 4758.686 * eq - 7193.992 * deep_arg.eosq + 3651.957 * eoc;
						g422 = -3581.69 + 16178.11 * eq - 24462.77 * deep_arg.eosq + 12422.52 * eoc;
		
						if (eq <= 0.715)
							g520 = 1464.74 - 4664.75 * eq + 3763.64 * deep_arg.eosq;
		
						else
							g520 = -5149.66 + 29936.92 * eq - 54087.36 * deep_arg.eosq + 31324.56 * eoc;
					}
		
					if (eq < 0.7)
					{
						g533 = -919.2277 + 4988.61 * eq - 9064.77 * deep_arg.eosq + 5542.21 * eoc;
						g521 = -822.71072 + 4568.6173 * eq - 8491.4146 * deep_arg.eosq + 5337.524 * eoc;
						g532 = -853.666 + 4690.25 * eq - 8624.77 * deep_arg.eosq + 5341.4 * eoc;
					}
		
					else
					{
						g533 = -37995.78 + 161616.52 * eq - 229838.2 * deep_arg.eosq + 109377.94 * eoc;
						g521 = -51752.104 + 218913.95 * eq - 309468.16 * deep_arg.eosq + 146349.42 * eoc;
						g532 = -40023.88 + 170470.89 * eq - 242699.48 * deep_arg.eosq + 115605.82 * eoc;
					}
		
					sini2 = deep_arg.sinio * deep_arg.sinio;
					f220 = 0.75 * (1 + 2 * deep_arg.cosio + deep_arg.theta2);
					f221 = 1.5 * sini2;
					f321 = 1.875 * deep_arg.sinio * (1 - 2 * deep_arg.cosio - 3 * deep_arg.theta2);
					f322 = -1.875 * deep_arg.sinio * (1 + 2 * deep_arg.cosio - 3 * deep_arg.theta2);
					f441 = 35 * sini2 * f220;
					f442 = 39.3750 * sini2 * sini2;
					f522 = 9.84375 * deep_arg.sinio * (sini2 * (1 - 2 * deep_arg.cosio - 5 * deep_arg.theta2) + 0.33333333 * (-2 + 4 * deep_arg.cosio + 6 * deep_arg.theta2));
					f523 = deep_arg.sinio * (4.92187512 * sini2 * (-2 - 4 * deep_arg.cosio + 10 * deep_arg.theta2) + 6.56250012 * (1 + 2 * deep_arg.cosio-3 * deep_arg.theta2));
					f542 = 29.53125 * deep_arg.sinio * (2 - 8 * deep_arg.cosio + deep_arg.theta2 * (-12 + 8 * deep_arg.cosio+10 * deep_arg.theta2));
					f543 = 29.53125 * deep_arg.sinio * (-2 - 8 * deep_arg.cosio + deep_arg.theta2 * (12 + 8 * deep_arg.cosio-10 * deep_arg.theta2));
					xno2 = PLib.Deep.xnq * PLib.Deep.xnq;
					ainv2 = aqnv * aqnv;
					temp1 = 3 * xno2 * ainv2;
					temp = temp1 * PLib.root22;
					PLib.Deep.d2201 = temp * f220 * g201;
					PLib.Deep.d2211 = temp * f221 * g211;
					temp1 = temp1 * aqnv;
					temp = temp1 * PLib.root32;
					PLib.Deep.d3210 = temp * f321 * g310;
					PLib.Deep.d3222 = temp * f322 * g322;
					temp1 = temp1 * aqnv;
					temp = 2 * temp1 * PLib.root44;
					PLib.Deep.d4410 = temp * f441 * g410;
					PLib.Deep.d4422 = temp * f442 * g422;
					temp1 = temp1 * aqnv;
					temp = temp1 * PLib.root52;
					PLib.Deep.d5220 = temp * f522 * g520;
					PLib.Deep.d5232 = temp * f523 * g532;
					temp = 2 * temp1 * PLib.root54;
					PLib.Deep.d5421 = temp * f542 * g521;
					PLib.Deep.d5433 = temp * f543 * g533;
					PLib.Deep.xlamo = xmao + tle.xnodeo + tle.xnodeo - PLib.Deep.thgr - PLib.Deep.thgr;
					bfact = deep_arg.xmdot + deep_arg.xnodot + deep_arg.xnodot - PLib.thdt - PLib.thdt;
					bfact = bfact + PLib.Deep.ssl + PLib.Deep.ssh + PLib.Deep.ssh;
				}
		
				else
				{
					PLib.SetFlag(PLib.RESONANCE_FLAG);
					PLib.SetFlag(PLib.SYNCHRONOUS_FLAG);
		
					g200 = 1 + deep_arg.eosq * (-2.5 + 0.8125 * deep_arg.eosq);
					g310 = 1 + 2 * deep_arg.eosq;
					g300 = 1 + deep_arg.eosq * (-6 + 6.60937 * deep_arg.eosq);
					f220 = 0.75 * (1 + deep_arg.cosio) * (1 + deep_arg.cosio);
					f311 = 0.9375 * deep_arg.sinio * deep_arg.sinio * (1 + 3 * deep_arg.cosio) - 0.75 * (1 + deep_arg.cosio);
					f330 = 1 + deep_arg.cosio;
					f330 = 1.875 * f330 * f330 * f330;
					PLib.Deep.del1 = 3 * PLib.Deep.xnq * PLib.Deep.xnq * aqnv * aqnv;
					PLib.Deep.del2 = 2 * PLib.Deep.del1 * f220 * g200 * q22;
					PLib.Deep.del3 = 3 * PLib.Deep.del1 * f330 * g300 * q33 * aqnv;
					PLib.Deep.del1 = PLib.Deep.del1 * f311 * g310 * q31 * aqnv;
					PLib.Deep.fasx2 = 0.13130908;
					PLib.Deep.fasx4 = 2.8843198;
					PLib.Deep.fasx6 = 0.37448087;
					PLib.Deep.xlamo = xmao + tle.xnodeo + tle.omegao - PLib.Deep.thgr;
					bfact = deep_arg.xmdot + xpidot - PLib.thdt;
					bfact = bfact + PLib.Deep.ssl + PLib.Deep.ssg + PLib.Deep.ssh;
				}
		
				PLib.Deep.xfact = bfact - PLib.Deep.xnq;
		
				PLib.Deep.xli = PLib.Deep.xlamo;
				PLib.Deep.xni = PLib.Deep.xnq;
				PLib.Deep.atime = 0;
				PLib.Deep.stepp = 720;
				PLib.Deep.stepn = -720;
				PLib.Deep.step2 = 259200;
		
				return;
		
				case dpsec:  /* Entrance for deep space secular effects */
				deep_arg.xll = deep_arg.xll + PLib.Deep.ssl * deep_arg.t;
				deep_arg.omgadf = deep_arg.omgadf + PLib.Deep.ssg * deep_arg.t;
				deep_arg.xnode = deep_arg.xnode + PLib.Deep.ssh * deep_arg.t;
				deep_arg.em = tle.eo + PLib.Deep.sse * deep_arg.t;
				deep_arg.xinc = tle.xincl + PLib.Deep.ssi * deep_arg.t;
		
				if (deep_arg.xinc < 0)
				{
					deep_arg.xinc = -deep_arg.xinc;
					deep_arg.xnode = deep_arg.xnode + pi;
					deep_arg.omgadf = deep_arg.omgadf - pi;
				}
		
				if (PLib.isFlagClear(PLib.RESONANCE_FLAG))
				      return;
		
				do
				{
					if ((PLib.Deep.atime == 0) || ((deep_arg.t >= 0) && (PLib.Deep.atime < 0)) || ((deep_arg.t < 0) && (PLib.Deep.atime >= 0)))
					{
						if (deep_arg.t >= 0)
							delt = PLib.Deep.stepp;
						else
							delt = PLib.Deep.stepn;
		
						PLib.Deep.atime = 0;
						PLib.Deep.xni = PLib.Deep.xnq;
						PLib.Deep.xli = PLib.Deep.xlamo;
					}
		
					else
					{
						if (Math.abs(deep_arg.t) >= Math.abs(PLib.Deep.atime))
						{
							if (deep_arg.t > 0)
								delt = PLib.Deep.stepp;
							else
								delt = PLib.Deep.stepn;
						}
					}
		
					do
					{
						if (Math.abs(deep_arg.t - PLib.Deep.atime) >= PLib.Deep.stepp)
						{
							PLib.SetFlag(PLib.DO_LOOP_FLAG);
							PLib.ClearFlag(PLib.EPOCH_RESTART_FLAG);
						}
		
						else
						{
							ft = deep_arg.t - PLib.Deep.atime;
							PLib.ClearFlag(PLib.DO_LOOP_FLAG);
						}
		
						if (Math.abs(deep_arg.t) < Math.abs(PLib.Deep.atime))
						{
							if (deep_arg.t >= 0)
								delt = PLib.Deep.stepn;
							else
								delt = PLib.Deep.stepp;
		
							PLib.SetFlag(PLib.DO_LOOP_FLAG | PLib.EPOCH_RESTART_FLAG);
						}
		
						if (PLib.isFlagSet(PLib.SYNCHRONOUS_FLAG))
						{
							xndot = PLib.Deep.del1 * Math.sin(PLib.Deep.xli - PLib.Deep.fasx2) + PLib.Deep.del2 * Math.sin(2 * (PLib.Deep.xli - PLib.Deep.fasx4)) + PLib.Deep.del3 * Math.sin(3 * (PLib.Deep.xli - PLib.Deep.fasx6));
							xnddt = PLib.Deep.del1 * Math.cos(PLib.Deep.xli - PLib.Deep.fasx2) + 2 * PLib.Deep.del2 * Math.cos(2 * (PLib.Deep.xli - PLib.Deep.fasx4)) + 3 * PLib.Deep.del3 * Math.cos(3 * (PLib.Deep.xli - PLib.Deep.fasx6));
						}
		
						else
						{
							xomi = PLib.Deep.omegaq + deep_arg.omgdot * PLib.Deep.atime;
							x2omi = xomi + xomi;
							x2li = PLib.Deep.xli + PLib.Deep.xli;
							xndot = PLib.Deep.d2201 * Math.sin(x2omi + PLib.Deep.xli - g22) + PLib.Deep.d2211 * Math.sin(PLib.Deep.xli - g22) + PLib.Deep.d3210 * Math.sin(xomi + PLib.Deep.xli - g32) + PLib.Deep.d3222 * Math.sin(-xomi + PLib.Deep.xli - g32) + PLib.Deep.d4410 * sin(x2omi + x2li - g44) + PLib.Deep.d4422 * sin(x2li - g44) + PLib.Deep.d5220 * sin(xomi + PLib.Deep.xli - g52) + PLib.Deep.d5232 * sin(-xomi + PLib.Deep.xli - g52) + PLib.Deep.d5421 * sin(xomi + x2li - g54) + PLib.Deep.d5433 * sin(-xomi + x2li - g54);
							xnddt = PLib.Deep.d2201 * Math.cos(x2omi + PLib.Deep.xli - g22) + PLib.Deep.d2211 * Math.cos(PLib.Deep.xli - g22) + PLib.Deep.d3210 * Math.cos(xomi + PLib.Deep.xli - g32) + PLib.Deep.d3222 * Math.cos(-xomi + PLib.Deep.xli - g32) + PLib.Deep.d5220 * cos(xomi + PLib.Deep.xli - g52) + PLib.Deep.d5232 * cos(-xomi + PLib.Deep.xli - g52) + 2 * (PLib.Deep.d4410 * cos(x2omi + x2li - g44) + PLib.Deep.d4422 * cos(x2li - g44) + PLib.Deep.d5421 * cos(xomi + x2li - g54) + PLib.Deep.d5433 * cos(-xomi + x2li - g54));
						}
		
						xldot = PLib.Deep.xni + PLib.Deep.xfact;
						xnddt = xnddt * xldot;
		
						if (PLib.isFlagSet(PLib.DO_LOOP_FLAG))
						{
							PLib.Deep.xli = PLib.Deep.xli + xldot * delt + xndot * PLib.Deep.step2;
							PLib.Deep.xni = PLib.Deep.xni + xndot * delt + xnddt * PLib.Deep.step2;
							PLib.Deep.atime = PLib.Deep.atime + delt;
						}
					} while (PLib.isFlagSet(PLib.DO_LOOP_FLAG) && PLib.isFlagClear(PLib.EPOCH_RESTART_FLAG));
				} while (PLib.isFlagSet(PLib.DO_LOOP_FLAG) && PLib.isFlagSet(PLib.EPOCH_RESTART_FLAG));
		
				deep_arg.xn = PLib.Deep.xni + xndot * ft + xnddt * ft * ft * 0.5;
				xl = PLib.Deep.xli + xldot * ft + xndot * ft * ft * 0.5;
				temp = -deep_arg.xnode + PLib.Deep.thgr + deep_arg.t * PLib.thdt;
		
				if (PLib.isFlagClear(PLib.SYNCHRONOUS_FLAG))
					deep_arg.xll = xl + temp + temp;
				else
					deep_arg.xll = xl - deep_arg.omgadf + temp;
		
				return;
		
				case dpper:
				sinis = Math.sin(deep_arg.xinc);
				cosis = Math.cos(deep_arg.xinc);
		
				if (Math.abs(PLib.Deep.savtsn - deep_arg.t) >= 30)
				{
					PLib.Deep.savtsn = deep_arg.t;
					zm = PLib.Deep.zmos + PLib.zns * deep_arg.t;
					zf = zm + 2 * PLib.zes * Math.sin(zm);
					sinzf = Math.sin(zf);
					f2 = 0.5 * sinzf * sinzf-0.25;
					f3 = -0.5 * sinzf * Math.cos(zf);
					ses = PLib.Deep.se2 * f2 + PLib.Deep.se3 * f3;
					sis = PLib.Deep.si2 * f2 + PLib.Deep.si3 * f3;
					sls = PLib.Deep.sl2 * f2 + PLib.Deep.sl3 * f3 + PLib.Deep.sl4 * sinzf;
					PLib.Deep.sghs = PLib.Deep.sgh2 * f2 + PLib.Deep.sgh3 * f3 + PLib.Deep.sgh4 * sinzf;
					PLib.Deep.shs = PLib.Deep.sh2 * f2 + PLib.Deep.sh3 * f3;
					zm = PLib.Deep.zmol + PLib.znl * deep_arg.t;
					zf = zm + 2 * zel * Math.sin(zm);
					sinzf = Math.sin(zf);
					f2 = 0.5 * sinzf * sinzf - 0.25;
					f3 = -0.5 * sinzf * Math.cos(zf);
					sel = PLib.Deep.ee2 * f2 + PLib.Deep.e3 * f3;
					sil = PLib.Deep.xi2 * f2 + PLib.Deep.xi3 * f3;
					sll = PLib.Deep.xl2 * f2 + PLib.Deep.xl3 * f3 + PLib.Deep.xl4 * sinzf;
					PLib.Deep.sghl = PLib.Deep.xgh2 * f2 + PLib.Deep.xgh3 * f3 + PLib.Deep.xgh4 * sinzf;
					PLib.Deep.sh1 = PLib.Deep.xh2 * f2 + PLib.Deep.xh3 * f3;
					PLib.Deep.pe = ses + sel;
					PLib.Deep.pinc = sis + sil;
					PLib.Deep.pl = sls + sll;
				}
		
				pgh = PLib.Deep.sghs + PLib.Deep.sghl;
				ph = PLib.Deep.shs + PLib.Deep.sh1;
				deep_arg.xinc = deep_arg.xinc + PLib.Deep.pinc;
				deep_arg.em = deep_arg.em + PLib.Deep.pe;
		
				if (PLib.Deep.xqncl >= 0.2)
				{
					ph = ph / deep_arg.sinio;
					pgh = pgh - deep_arg.cosio * ph;
					deep_arg.omgadf = deep_arg.omgadf + pgh;
					deep_arg.xnode = deep_arg.xnode + ph;
					deep_arg.xll = deep_arg.xll + PLib.Deep.pl;
				}
		
				else
				{
					sinok = Math.sin(deep_arg.xnode);
					cosok = Math.cos(deep_arg.xnode);
					alfdp = sinis * sinok;
					betdp = sinis * cosok;
					dalf = ph * cosok + PLib.Deep.pinc * cosis * sinok;
					dbet = -ph * sinok + PLib.Deep.pinc * cosis * cosok;
					alfdp = alfdp + dalf;
					betdp = betdp + dbet;
					deep_arg.xnode = FMod2p(deep_arg.xnode);
					xls = deep_arg.xll + deep_arg.omgadf + cosis * deep_arg.xnode;
					dls = PLib.Deep.pl + pgh - PLib.Deep.pinc * deep_arg.xnode * sinis;
					xls = xls + dls;
					xnoh = deep_arg.xnode;
					deep_arg.xnode = Math.atan2(alfdp, betdp);
		
					if (Math.abs(xnoh - deep_arg.xnode) > PLib.pi)
					{
					      if (deep_arg.xnode < xnoh)
						  deep_arg.xnode += PLib.twopi;
					      else
						  deep_arg.xnode -= PLib.twopi;
					}
		
					deep_arg.xll = deep_arg.xll + PLib.Deep.pl;
					deep_arg.omgadf = xls - deep_arg.xll - Math.cos(deep_arg.xinc) * deep_arg.xnode;
				}
				return;
			}
		},
		
		SDP4: function(tsince, tle, pos, vel)
		{
			var i = 0;
		
			var a = 0.0, axn = 0.0, ayn = 0.0, aynl = 0.0, beta = 0.0, betal = 0.0, capu = 0.0, cos2u = 0.0, cosepw = 0.0, cosik = 0.0,
				cosnok = 0.0, cosu = 0.0, cosuk = 0.0, ecose = 0.0, elsq = 0.0, epw = 0.0, esine = 0.0, pl = 0.0, theta4 = 0.0, rdot = 0.0,
				rdotk = 0.0, rfdot = 0.0, rfdotk = 0.0, rk = 0.0, sin2u = 0.0, sinepw = 0.0, sinik = 0.0, sinnok = 0.0, sinu = 0.0,
				sinuk = 0.0, tempe = 0.0, templ = 0.0, tsq = 0.0, u = 0.0, uk = 0.0, ux = 0.0, uy = 0.0, uz = 0.0, vx = 0.0, vy = 0.0, vz = 0.0, xinck = 0.0, xl = 0.0,
				xlt = 0.0, xmam = 0.0, xmdf = 0.0, xmx = 0.0, xmy = 0.0, xnoddf = 0.0, xnodek = 0.0, xll = 0.0, a1 = 0.0, a3ovk2 = 0.0, ao = 0.0, c2 = 0.0,
				coef = 0.0, coef1 = 0.0, x1m5th = 0.0, xhdot1 = 0.0, del1 = 0.0, r = 0.0, delo = 0.0, eeta = 0.0, eta = 0.0, etasq = 0.0,
				perigee = 0.0, psisq = 0.0, tsi = 0.0, qoms24 = 0.0, s4 = 0.0, pinvsq = 0.0, temp = 0.0, tempa = 0.0, temp1 = 0.0,
				temp2 = 0.0, temp3 = 0.0, temp4 = 0.0, temp5 = 0.0, temp6 = 0.0, bx = 0.0, by = 0.0, bz = 0.0, cx = 0.0, cy = 0.0, cz = 0.0;
		
			PLib.SDP4.deep_arg = PLib.SDP4.deep_arg || new PLib.deep_arg_t();
		
			if (PLib.isFlagClear(PLib.SDP4_INITIALIZED_FLAG))
			{
				PLib.SetFlag(PLib.SDP4_INITIALIZED_FLAG);
		
				a1 = Math.pow(PLib.xke / tle.xno, PLib.tothrd);
				PLib.SDP4.deep_arg.cosio = Math.cos(tle.xincl);
				PLib.SDP4.deep_arg.theta2 = PLib.SDP4.deep_arg.cosio * PLib.SDP4.deep_arg.cosio;
				PLib.SDP4.x3thm1 = 3 * PLib.SDP4.deep_arg.theta2 - 1;
				PLib.SDP4.deep_arg.eosq = tle.eo * tle.eo;
				PLib.SDP4.deep_arg.betao2 = 1 - PLib.SDP4.deep_arg.eosq;
				PLib.SDP4.deep_arg.betao = Math.sqrt(PLib.SDP4.deep_arg.betao2);
				del1 = 1.5 * PLib.ck2 * PLib.SDP4.x3thm1 / (a1 * a1 * PLib.SDP4.deep_arg.betao * PLib.SDP4.deep_arg.betao2);
				ao = a1 * (1 - del1 * (0.5 * PLib.tothrd + del1 * (1 + 134 / 81 * del1)));
				delo = 1.5 * PLib.ck2 * PLib.SDP4.x3thm1 / (ao * ao * PLib.SDP4.deep_arg.betao * PLib.SDP4.deep_arg.betao2);
				PLib.SDP4.deep_arg.xnodp = tle.xno / (1 + delo);
				PLib.SDP4.deep_arg.aodp = ao / (1 - delo);
		
				s4 = s;
				qoms24 = PLib.qoms2t;
				perigee = (PLib.SDP4.deep_arg.aodp * (1 - tle.eo) - PLib.ae) * PLib.xkmper;
			 
				if (perigee < 156.0)
				{
					if (perigee <= 98.0)
						s4 = 20.0;
					else
						s4 = perigee - 78.0;
		
					qoms24 = Math.pow((120 - s4) * PLib.ae / xkmper,4);
					s4 = s4 / PLib.xkmper + PLib.ae;
				}
		
				pinvsq = 1 / (PLib.SDP4.deep_arg.aodp * PLib.SDP4.deep_arg.aodp * PLib.SDP4.deep_arg.betao2 * PLib.SDP4.deep_arg.betao2);
				PLib.SDP4.deep_arg.sing = Math.sin(tle.omegao);
				PLib.SDP4.deep_arg.cosg = Math.cos(tle.omegao);
				tsi = 1 / (PLib.SDP4.deep_arg.aodp - s4);
				eta = PLib.SDP4.deep_arg.aodp * tle.eo * tsi;
				etasq = eta * eta;
				eeta = tle.eo * eta;
				psisq = Math.abs(1 - etasq);
				coef = qoms24 * Math.pow(tsi, 4);
				coef1 = coef / Math.pow(psisq, 3.5);
				c2 = coef1 * PLib.SDP4.deep_arg.xnodp * (PLib.SDP4.deep_arg.aodp * (1 + 1.5 * etasq + eeta * (4 + etasq)) + 0.75 * PLib.ck2 * tsi / psisq * PLib.SDP4.x3thm1 * (8 + 3 * etasq * (8 + etasq)));
				PLib.SDP4.c1 = tle.bstar * c2;
				PLib.SDP4.deep_arg.sinio = Math.sin(tle.xincl);
				a3ovk2 = -xj3 / ck2 * Math.pow(ae, 3);
				PLib.SDP4.x1mth2 = 1 -PLib.SDP4.deep_arg.theta2;
				PLib.SDP4.c4 = 2 * PLib.SDP4.deep_arg.xnodp * coef1 * PLib.SDP4.deep_arg.aodp * PLib.SDP4.deep_arg.betao2 * (eta * (2 + 0.5 * etasq) + tle.eo * (0.5 + 2 * etasq) - 2 * PLib.ck2 * tsi / (PLib.SDP4.deep_arg.aodp * psisq) * (-3 * PLib.SDP4.x3thm1 * (1 - 2 * eeta + etasq * (1.5 - 0.5 * eeta)) + 0.75 * PLib.SDP4.x1mth2 * (2 * etasq - eeta * (1 + etasq)) * Math.cos(2 * tle.omegao)));
				theta4 = PLib.SDP4.deep_arg.theta2 * PLib.SDP4.deep_arg.theta2;
				temp1 = 3 * PLib.ck2 * pinvsq * PLib.SDP4.deep_arg.xnodp;
				temp2 = temp1 * PLib.ck2 * pinvsq;
				temp3 = 1.25 * PLib.ck4 * pinvsq * pinvsq * PLib.SDP4.deep_arg.xnodp;
				PLib.SDP4.deep_arg.xmdot = PLib.SDP4.deep_arg.xnodp + 0.5 * temp1 * PLib.SDP4.deep_arg.betao * PLib.SDP4.x3thm1 + 0.0625 * temp2 * PLib.SDP4.deep_arg.betao * (13 - 78 * PLib.SDP4.deep_arg.theta2 + 137 * theta4);
				x1m5th = 1 - 5 * PLib.SDP4.deep_arg.theta2;
				PLib.SDP4.deep_arg.omgdot = -0.5 * temp1 * x1m5th + 0.0625 * temp2 * (7 - 114 * PLib.SDP4.deep_arg.theta2 + 395 * theta4) + temp3 * (3 - 36 * PLib.SDP4.deep_arg.theta2 + 49 * theta4);
				xhdot1 = -temp1 * PLib.SDP4.deep_arg.cosio;
				PLib.SDP4.deep_arg.xnodot = xhdot1 + (0.5 * temp2 * (4 - 19 * PLib.SDP4.deep_arg.theta2) + 2 * temp3 * (3 - 7 * PLib.SDP4.deep_arg.theta2)) * PLib.SDP4.deep_arg.cosio;
				PLib.SDP4.xnodcf = 3.5 * PLib.SDP4.deep_arg.betao2 * xhdot1 * PLib.SDP4.c1;
				PLib.SDP4.t2cof = 1.5 * PLib.SDP4.c1;
				PLib.SDP4.xlcof = 0.125 * a3ovk2 * PLib.SDP4.deep_arg.sinio * (3 + 5 * PLib.SDP4.deep_arg.cosio) / (1 + PLib.SDP4.deep_arg.cosio);
				PLib.SDP4.aycof = 0.25 * a3ovk2 * PLib.SDP4.deep_arg.sinio;
				PLib.SDP4.x7thm1 = 7 * PLib.SDP4.deep_arg.theta2 - 1;
		
				Deep(dpinit, tle, PLib.SDP4.deep_arg);
			}
		
			xmdf = tle.xmo + PLib.SDP4.deep_arg.xmdot * tsince;
			PLib.SDP4.deep_arg.omgadf = tle.omegao + PLib.SDP4.deep_arg.omgdot * tsince;
			xnoddf = tle.xnodeo + PLib.SDP4.deep_arg.xnodot * tsince;
			tsq = tsince * tsince;
			PLib.SDP4.deep_arg.xnode = xnoddf + PLib.SDP4.xnodcf * tsq;
			tempa = 1 - PLib.SDP4.c1 * tsince;
			tempe = tle.bstar * PLib.SDP4.c4 * tsince;
			templ = PLib.SDP4.t2cof * tsq;
			PLib.SDP4.deep_arg.xn = PLib.SDP4.deep_arg.xnodp;
		
			PLib.SDP4.deep_arg.xll = xmdf;
			PLib.SDP4.deep_arg.t = tsince;
		
			Deep(dpsec, tle, PLib.SDP4.deep_arg);
		
			xmdf = PLib.SDP4.deep_arg.xll;
			a = Math.pow(PLib.xke / PLib.SDP4.deep_arg.xn, PLib.tothrd) * tempa * tempa;
			PLib.SDP4.deep_arg.em = PLib.SDP4.deep_arg.em - tempe;
			xmam = xmdf + PLib.SDP4.deep_arg.xnodp * templ;
		
			PLib.SDP4.deep_arg.xll = xmam;
		
			Deep(PLib.dpper, tle, PLib.SDP4.deep_arg);
		
			xmam = PLib.SDP4.deep_arg.xll;
			xl = xmam + PLib.SDP4.deep_arg.omgadf + PLib.SDP4.deep_arg.xnode;
			beta = Math.sqrt(1 - PLib.SDP4.deep_arg.em * PLib.SDP4.deep_arg.em);
			PLib.SDP4.deep_arg.xn = PLib.xke / Math.pow(a, 1.5);
		
			axn = PLib.SDP4.deep_arg.em * Math.cos(PLib.SDP4.deep_arg.omgadf);
			temp = 1 / (a * beta * beta);
			xll = temp * PLib.SDP4.xlcof * axn;
			aynl = temp * PLib.SDP4.aycof;
			xlt = xl + xll;
			ayn = PLib.SDP4.deep_arg.em * Math.sin(PLib.SDP4.deep_arg.omgadf) + aynl;
		
			capu = FMod2p(xlt - PLib.SDP4.deep_arg.xnode);
			temp2 = capu;
			i = 0;
		
			do
			{
				sinepw = Math.sin(temp2);
				cosepw = Math.cos(temp2);
				temp3 = axn * sinepw;
				temp4 = ayn * cosepw;
				temp5 = axn * cosepw;
				temp6 = ayn * sinepw;
				epw = (capu - temp4 + temp3 - temp2) / (1 - temp5 - temp6) + temp2;
		
				if (Math.abs(epw - temp2) <= e6a)
					break;
		
				temp2 = epw;
		
			} while (i++ < 10);
		
			ecose = temp5 + temp6;
			esine = temp3 - temp4;
			elsq = axn * axn + ayn * ayn;
			temp = 1 - elsq;
			pl = a * temp;
			r = a * (1 - ecose);
			temp1 = 1 / r;
			rdot = PLib.xke * Math.sqrt(a) * esine * temp1;
			rfdot = PLib.xke * Math.sqrt(pl) * temp1;
			temp2 = a * temp1;
			betal = Math.sqrt(temp);
			temp3 = 1 / (1 + betal);
			cosu = temp2 * (cosepw - axn + ayn * esine * temp3);
			sinu = temp2 * (sinepw - ayn - axn * esine * temp3);
			u = Math.atan2(sinu, cosu);
			sin2u = 2 * sinu * cosu;
			cos2u = 2 * cosu * cosu - 1;
			temp = 1 / pl;
			temp1 = PLib.ck2 * temp;
			temp2 = temp1 * temp;
		
			rk = r * (1 - 1.5 * temp2 * betal * PLib.SDP4.x3thm1) + 0.5 * temp1 * PLib.SDP4.x1mth2 * cos2u;
			uk = u - 0.25 * temp2 * PLib.SDP4.x7thm1 * sin2u;
			xnodek = PLib.SDP4.deep_arg.xnode + 1.5 * temp2 * PLib.SDP4.deep_arg.cosio * sin2u;
			xinck = PLib.SDP4.deep_arg.xinc + 1.5 * temp2 * PLib.SDP4.deep_arg.cosio * PLib.SDP4.deep_arg.sinio * cos2u;
			rdotk = rdot - PLib.SDP4.deep_arg.xn * temp1 * PLib.SDP4.x1mth2 * sin2u;
			rfdotk = rfdot + PLib.SDP4.deep_arg.xn * temp1 * (PLib.SDP4.x1mth2 * cos2u + 1.5 * PLib.SDP4.x3thm1);
		
			sinuk = Math.sin(uk);
			cosuk = Math.cos(uk);
			sinik = Math.sin(xinck);
			cosik = Math.cos(xinck);
			sinnok = Math.sin(xnodek);
			cosnok = Math.cos(xnodek);
			xmx = -sinnok * cosik;
			xmy = cosnok * cosik;
			ux = xmx * sinuk + cosnok * cosuk;
			uy = xmy * sinuk + sinnok * cosuk;
			uz = sinik * sinuk;
			vx = xmx * cosuk - cosnok * sinuk;
			vy = xmy * cosuk - sinnok * sinuk;
			vz = sinik * cosuk;
		
			pos.x = rk * ux;
			pos.y = rk * uy;
			pos.z = rk * uz;
			vel.x = rdotk * ux + rfdotk * vx;
			vel.y = rdotk * uy + rfdotk * vy;
			vel.z = rdotk * uz + rfdotk * vz;
		
			PLib.phase = xlt - PLib.SDP4.deep_arg.xnode - PLib.SDP4.deep_arg.omgadf + PLib.twopi;
		
			if (PLib.phase < 0.0)
				PLib.phase += PLib.twopi;
		
			PLib.phase = PLib.FMod2p(PLib.phase);
		},
		
		Calculate_User_PosVel: function(time, geodetic, obs_pos, obs_vel)
		{
			var c = 0.0, sq = 0.0, achcp = 0.0;
		
			geodetic.theta = PLib.FMod2p(PLib.ThetaG_JD(time) + geodetic.lon);
			c = 1 / Math.sqrt(1 + PLib.f * (PLib.f - 2) * PLib.Sqr(Math.sin(geodetic.lat)));
			sq = PLib.Sqr(1 - PLib.f) * c;
			achcp = (PLib.xkmper * c + geodetic.alt) * Math.cos(geodetic.lat);
			obs_pos.x = achcp * Math.cos(geodetic.theta);
			obs_pos.y = achcp * Math.sin(geodetic.theta);
			obs_pos.z = (PLib.xkmper * sq + geodetic.alt) * Math.sin(geodetic.lat);
			obs_vel.x = -PLib.mfactor * obs_pos.y;
			obs_vel.y = PLib.mfactor * obs_pos.x;
			obs_vel.z = 0;
			PLib.Magnitude(obs_pos);
			PLib.Magnitude(obs_vel);
		},
		
		Calculate_LatLonAlt: function(time, pos, geodetic)
		{
			var r = 0.0, e2 = 0.0, phi = 0.0, c = 0.0;
		
			geodetic.theta = Math.atan2(pos.y, pos.x);
			geodetic.lon = PLib.FMod2p(geodetic.theta - PLib.ThetaG_JD(time));
			r = Math.sqrt(PLib.Sqr(pos.x) + PLib.Sqr(pos.y));
			e2 = PLib.f * (2 - PLib.f);
			geodetic.lat = Math.atan2(pos.z, r);
		
			do
			{
				phi = geodetic.lat;
				c = 1 / Math.sqrt(1 - e2 * PLib.Sqr(Math.sin(phi)));
				geodetic.lat = Math.atan2(pos.z + PLib.xkmper * c * e2 * Math.sin(phi), r);
		
			} while (Math.abs(geodetic.lat - phi) >= 1E-10);
		
			geodetic.alt = r / Math.cos(geodetic.lat) - PLib.xkmper * c;
		
			if (geodetic.lat > PLib.pio2)
				geodetic.lat -= PLib.twopi;
		},
		
		Calculate_Obs: function(time, pos, vel, geodetic, obs_set)
		{
			var sin_lat = 0.0, cos_lat = 0.0, sin_theta = 0.0, cos_theta = 0.0, el = 0.0, azim = 0.0, top_s = 0.0, top_e = 0.0, top_z = 0.0;
		
			var obs_pos = new PLib.vector_t();
			var obs_vel = new PLib.vector_t();
			var range = new PLib.vector_t();
			var rgvel = new PLib.vector_t();
		
			PLib.Calculate_User_PosVel(time, geodetic, obs_pos, obs_vel);
		
			range.x = pos.x - obs_pos.x;
			range.y = pos.y - obs_pos.y;
			range.z = pos.z - obs_pos.z;
		
			rx = range.x;
			ry = range.y;
			rz = range.z;
		
			rgvel.x = vel.x - obs_vel.x;
			rgvel.y = vel.y - obs_vel.y;
			rgvel.z = vel.z - obs_vel.z;
		
			PLib.Magnitude(range);
		
			sin_lat = Math.sin(geodetic.lat);
			cos_lat = Math.cos(geodetic.lat);
			sin_theta = Math.sin(geodetic.theta);
			cos_theta = Math.cos(geodetic.theta);
			top_s = sin_lat * cos_theta * range.x + sin_lat * sin_theta * range.y - cos_lat * range.z;
			top_e = -sin_theta * range.x + cos_theta * range.y;
			top_z = cos_lat * cos_theta * range.x+cos_lat * sin_theta * range.y + sin_lat * range.z;
			azim = Math.atan(-top_e / top_s);
		
			if (top_s > 0.0)
				azim = azim + PLib.pi;
		
			if (azim < 0.0)
				azim = azim + PLib.twopi;
		
			el = Math.asin(top_z / range.w);
			obs_set.x = azim;
			obs_set.y = el;
			obs_set.z = range.w;
		
			obs_set.w = PLib.Dot(range, rgvel) / range.w;
		
			obs_set.y = el;
		
			if (obs_set.y >= 0.0)
				PLib.SetFlag(PLib.VISIBLE_FLAG);
			else
			{
				obs_set.y = el;
				PLib.ClearFlag(PLib.VISIBLE_FLAG);
			}
		},
		
		InternalUpdate: function(x)
		{
			var tempnum;
		
			PLib.sat[x].designator = PLib.sat[x].line1.substring(9, 17);
			PLib.sat[x].catnum = PLib.sat[x].line1.substring(2, 7);
			PLib.sat[x].year = PLib.sat[x].line1.substring(18, 20);
			PLib.sat[x].refepoch = PLib.sat[x].line1.substring(20, 32);
			tempnum = 1.0e-5 * PLib.sat[x].line1.substring(44, 50);
			PLib.sat[x].nddot6 = tempnum / Math.pow(10.0, PLib.sat[x].line1.charAt(51));
			tempnum = 1.0e-5 * PLib.sat[x].line1.substring(53, 59);
			PLib.sat[x].bstar = tempnum / Math.pow(10.0, PLib.sat[x].line1.charAt(60));
			PLib.sat[x].setnum = PLib.sat[x].line1.substring(64, 68);
			PLib.sat[x].incl = PLib.sat[x].line2.substring(8, 16);
			PLib.sat[x].raan = PLib.sat[x].line2.substring(17, 25);
			PLib.sat[x].eccn = 1.0e-07 * PLib.sat[x].line2.substring(26,33);
			PLib.sat[x].argper = PLib.sat[x].line2.substring(34, 42);
			PLib.sat[x].meanan = PLib.sat[x].line2.substring(43, 51);
			PLib.sat[x].meanmo = PLib.sat[x].line2.substring(52, 63);
			PLib.sat[x].drag = PLib.sat[x].line1.substring(33, 43);
			PLib.sat[x].orbitnum = PLib.sat[x].line2.substring(63, 68);
		},

		InitializeData: function()
		{
			for (var z = 0; z < PLib.tleData.length; z++)
			{
				PLib.sat[z] = new PLib.sat_t();
				PLib.sat[z].name = PLib.tleData[z][0];
				PLib.sat[z].line1 = PLib.tleData[z][1];
				PLib.sat[z].line2 = PLib.tleData[z][2];
				PLib.InternalUpdate(z);				
			}
		},

		DayNum: function(m, d, y)
		{
			var dn = 0;
			var mm = 0.0, yy = 0.0;
		
			if (m < 3)
			{
				y--;
				m += 12;
			}
		
			if (y <= 50)
				y += 100;
		
			yy = y;
			mm = m;
			dn = (Math.floor(365.25 * (yy - 80.0)) - Math.floor(19.0 + yy / 100.0) + Math.floor(4.75 + yy / 400.0) - 16.0);
			dn += d + 30 * m + Math.floor(0.6 * mm - 0.3);
			
			return dn;
		},
		
		CurrentDaynum: function()
		{
			var d = new Date();
			return (d.getTime() - 315446400000) / 86400000;
		},
		
		Daynum2Date: function(daynum)
		{
			var d = new Date();
			d.setTime(daynum * 86400000 + 315446400000);
			var x = d + 1;
			return d;
		},

		PreCalc: function(x)
		{
			PLib.tle.sat_name = PLib.sat[x].name
			PLib.tle.idesg = PLib.sat[x].designator;
			PLib.tle.catnr = PLib.sat[x].catnum;
			PLib.tle.epoch = (1000.0 * PLib.sat[x].year) + PLib.sat[x].refepoch * 1;
			PLib.tle.xndt2o = PLib.sat[x].drag;
			PLib.tle.xndd6o = PLib.sat[x].nddot6;
			PLib.tle.bstar = PLib.sat[x].bstar;
			PLib.tle.xincl = PLib.sat[x].incl;
			PLib.tle.xnodeo = PLib.sat[x].raan;
			PLib.tle.eo = PLib.sat[x].eccn;
			PLib.tle.omegao = PLib.sat[x].argper;
			PLib.tle.xmo = PLib.sat[x].meanan;
			PLib.tle.xno = PLib.sat[x].meanmo;
			PLib.tle.revnum = PLib.sat[x].orbitnum;
		
			PLib.ClearFlag(PLib.ALL_FLAGS);
			PLib.select_ephemeris(PLib.tle);
		},

		Calc: function()
		{
			var zero_vector = new PLib.vector_t();
			var vel = new PLib.vector_t();
			var pos = new PLib.vector_t();
			var obs_set = new PLib.vector_t();
			var solar_vector = new PLib.vector_t();
			var solar_set = new PLib.vector_t();
		
			var sat_geodetic = new PLib.geodetic_t();
		
			PLib.jul_utc = PLib.daynum + 2444238.5;
		
			PLib.jul_epoch = PLib.Julian_Date_of_Epoch(PLib.tle.epoch);
			PLib.tsince = (PLib.jul_utc - PLib.jul_epoch) * PLib.xmnpda;
			PLib.age = PLib.jul_utc - PLib.jul_epoch;
		
			if (PLib.isFlagSet(PLib.DEEP_SPACE_EPHEM_FLAG))
				PLib.ephem = "SDP4";
			else
				PLib.ephem = "SGP4";
		
			if (PLib.isFlagSet(PLib.DEEP_SPACE_EPHEM_FLAG))
				PLib.SDP4(PLib.tsince, PLib.tle, pos, vel);
			else
				PLib.SGP4(PLib.tsince, PLib.tle, pos, vel);
		
			PLib.Convert_Sat_State(pos, vel);
		
			PLib.Magnitude(vel);
			PLib.sat_vel = vel.w;
		
			PLib.Calculate_Obs(PLib.jul_utc, pos, vel, PLib.obs_geodetic, obs_set);
		
			PLib.Calculate_LatLonAlt(PLib.jul_utc, pos, sat_geodetic);
		
			PLib.Calculate_Solar_Position(PLib.jul_utc, solar_vector);
			PLib.Calculate_Obs(PLib.jul_utc, solar_vector, zero_vector, PLib.obs_geodetic, solar_set);
		
			if (PLib.Sat_Eclipsed(pos, solar_vector))
				PLib.SetFlag(PLib.SAT_ECLIPSED_FLAG);
			else
				PLib.ClearFlag(PLib.SAT_ECLIPSED_FLAG);
		
			if (PLib.isFlagSet(PLib.SAT_ECLIPSED_FLAG))
				PLib.sat_sun_status = 0;
			else
				PLib.sat_sun_status = 1;
		
			PLib.sat_azi = PLib.Degrees(obs_set.x);
			PLib.sat_ele = PLib.Degrees(obs_set.y);
			PLib.sat_range = obs_set.z;
			PLib.sat_range_rate = obs_set.w;
			PLib.sat_lat = PLib.Degrees(sat_geodetic.lat);
			PLib.sat_lon = PLib.Degrees(sat_geodetic.lon);
			PLib.sat_alt = sat_geodetic.alt;
		
			PLib.fk = 12756.33 * Math.acos(PLib.xkmper / (PLib.xkmper + PLib.sat_alt));
			PLib.fm = PLib.fk / 1.609344;
		
			PLib.rv = Math.floor((PLib.tle.xno * PLib.xmnpda / PLib.twopi + PLib.age * PLib.tle.bstar * PLib.ae) * PLib.age + PLib.tle.xmo / PLib.twopi) + parseInt(PLib.tle.revnum);
		
			PLib.sun_azi = PLib.Degrees(solar_set.x);
			PLib.sun_ele = PLib.Degrees(solar_set.y);
		
			PLib.irk = Math.round(PLib.sat_range);
			PLib.isplat = Math.round(PLib.sat_lat);
			PLib.isplong = Math.round(360.0 - PLib.sat_lon);
			PLib.iaz = Math.round(PLib.sat_azi);
			PLib.iel = Math.round(PLib.sat_ele);
			PLib.ma256 = Math.round(256.0 * (PLib.phase / PLib.twopi));
		
			if (PLib.sat_sun_status)
			{
				if (PLib.sun_ele <= -12.0 && PLib.sat_ele >= 0.0)
					PLib.findsun = '+';
				else
					PLib.findsun = '*';
			}
			else
				PLib.findsun = ' ';
		},
		
		AosHappens: function(x)
		{
			var lin = 0.0, sma = 0.0, apogee = 0.0;
		
			if (PLib.sat[x].meanmo == 0.0)
				return 0;
			else
			{
				lin = PLib.sat[x].incl;
		
				if (lin >= 90.0)
					lin = 180.0 - lin;
		
				sma = 331.25 * Math.exp(Math.log(1440.0 / PLib.sat[x].meanmo) * (2.0 / 3.0));
				apogee = sma * (1.0 + PLib.sat[x].eccn) - PLib.xkmper;
		
				if ((Math.acos(PLib.xkmper / (apogee + PLib.xkmper)) + (lin * PLib.deg2rad)) > Math.abs(PLib.qth.stnlat * PLib.deg2rad))
					return 1;
				else
					return 0;
			}
		},
	
		Decayed: function(x, time)
		{
			var satepoch = 0.0;
		
			if (time == 0.0)
				time = PLib.CurrentDaynum();
		
			satepoch = PLib.DayNum(1, 0, PLib.sat[x].year) + PLib.sat[x].refepoch;
		
			if (satepoch + ((16.666666 - PLib.sat[x].meanmo) / (10.0 * Math.abs(PLib.sat[x].drag))) < time)
				return 1;
			else
				return 0;
		},
	
		Geostationary: function(x)
		{
			if (Math.abs(PLib.sat[x].meanmo - 1.0027) < 0.0002) 
				return 1;
			else
				return 0;
		},
	
		FindAOS: function()
		{
			PLib.aostime = 0.0;
		
			if (PLib.AosHappens(indx) && PLib.Geostationary(indx) == 0 && PLib.Decayed(indx, PLib.daynum) == 0)
			{
				PLib.Calc();
		
				while (PLib.sat_ele < -1.0)
				{
					PLib.daynum -= 0.00035 * (PLib.sat_ele * (((PLib.sat_alt / 8400.0) + 0.46)) - 2.0);
					PLib.Calc();
				}
		
				while (PLib.aostime == 0.0)
				{
					if (Math.abs(PLib.sat_ele) < 0.03)
						PLib.aostime = PLib.daynum;
					else
					{
						PLib.daynum -= PLib.sat_ele * Math.sqrt(PLib.sat_alt) / 530000.0;
						PLib.Calc();
					}
				}
			}
		
			return PLib.aostime;
		},
	
		FindLOS: function()
		{
			PLib.lostime = 0.0;
		
			if (PLib.Geostationary(indx) == 0 && PLib.AosHappens(indx) == 1 && PLib.Decayed(indx, PLib.daynum) == 0)
			{
				PLib.Calc();
		
				do
				{
					PLib.daynum += PLib.sat_ele * Math.sqrt(PLib.sat_alt) / 502500.0;
					PLib.Calc();
		
					if (Math.abs(PLib.sat_ele) < 0.03)
						PLib.lostime = PLib.daynum;
		
				} while (PLib.lostime == 0.0);
			}
		
			return PLib.lostime;
		},

		QuickFind: function(satname)
		{
			var satInfo = new Object();

			for (var z = 0; z < 24; z++)
			{
				if ((PLib.sat[z].name == satname) || (satname == PLib.sat[z].catnum))
				{
					PLib.daynum = PLib.CurrentDaynum();
					PLib.PreCalc(z);
					PLib.Calc();
	
					if (PLib.Decayed(z, PLib.daynum) == 0)
					{
						satInfo.dateTime = PLib.Daynum2Date(PLib.daynum);
						satInfo.elevation = PLib.iel;
						satInfo.azimuth = PLib.iaz;
						satInfo.orbitalPhase = PLib.ma256;
						satInfo.latitude = PLib.isplat;
		
						var lng = 360 - PLib.isplong;
						if (lng > 180) lng = -PLib.isplong;
						satInfo.longitude = lng;

						satInfo.slantRange = PLib.irk;
						satInfo.orbitNumber = PLib.rv;
						satInfo.visibility = PLib.findsun;
					}
		
					break;
				}
			}
		
			return satInfo;
		},

		formatDateOnly: function(dt)
		{
			var months = [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ];
			return months[dt.getMonth()] + " " + dt.getDate();
		},

		formatTimeOnly: function(dt)
		{
			var h = dt.getHours();
			var m = dt.getMinutes();

			var amPm = h < 12 ? "AM" : "PM"

			h = h > 12 ? h - 12 : h;
			h = h == 0 ? h = 12 : h;
			m = m < 10 ? "0" + m : m;

			return h + ":" + m + amPm;
		},

		extractDate: function(dt)
		{
			var d = new Date();
			d.setTime(dt.valueOf());
			d.setHours(0);
			d.setMinutes(0);
			d.setSeconds(0);
			d.setMilliseconds(0);

			return d;
		},

		addDay: function(dt)
		{
		    var d = new Date(dt.getTime() + 86400000);
		    return d;
		},

		getTodaysPasses: function()
		{
			var satInfoColl = new Array();
			var arrIdx = 0;
			var x = 0, y = 0, z = 0, lastel = 0;
			var start = 0, now = 0;

			for (z = 0; z < PLib.sat.length; z++)
			{
				indx = z;

				now = (3651.0 + PLib.CurrentDaynum()) * 86400.0;

				if (start == 0)
					start = now;

				if ((start >= now - 31557600) && (start <= now + 31557600))
				{
					PLib.daynum = (start / 86400.0) - 3651.0;
					PLib.PreCalc(indx);
					PLib.Calc();

					var d = new Date();
					var passNo = 1;

					if (PLib.AosHappens(indx) && PLib.Geostationary(indx) == 0 && PLib.Decayed(indx, PLib.daynum) == 0)
					{
						PLib.daynum = PLib.FindAOS();

						while (PLib.Daynum2Date(PLib.daynum) < PLib.addDay(d))
						{
							var satInfo = new Object();

							satInfo.number = z + 1;
							satInfo.name = PLib.sat[z].name;
							satInfo.passNo = passNo++;
							satInfo.dateTimeStart = PLib.Daynum2Date(PLib.daynum);
							satInfo.peakElevation = PLib.iel;
							satInfo.riseAzimuth
								= satInfo.peakAzimuth
								= PLib.iaz;
							satInfo.orbitalPhase = PLib.ma256;
							satInfo.latitude = PLib.isplat;

							var lng = 360 - PLib.isplong;
							if (lng > 180) lng = -PLib.isplong;
							satInfo.longitude = lng;

							satInfo.riseRange
								= satInfo.peakRange
								= PLib.irk;
							satInfo.orbitNumber = PLib.rv;

							var plusCount = 0;
							var asteriskCount = 0;

							while (PLib.iel >= 0)
							{
								if (PLib.iel > satInfo.peakElevation)
								{
									satInfo.peakElevation = PLib.iel;
									satInfo.peakAzimuth = PLib.iaz;
									satInfo.peakRange = PLib.irk;
								}

								if (PLib.findsun == '+')
									plusCount++;
								else if (PLib.findsun == '*')
									asteriskCount++;

								lastel = PLib.iel;
								PLib.daynum += Math.cos((PLib.sat_ele - 1.0) * PLib.deg2rad) * Math.sqrt(PLib.sat_alt) / 25000.0;
								PLib.Calc();
							}

							if (lastel != 0)
							{
								PLib.daynum = PLib.FindLOS();
								PLib.Calc();
							}

							satInfo.dateTimeEnd = PLib.Daynum2Date(PLib.daynum);
							satInfo.decayAzimuth = PLib.iaz;
							satInfo.decayRange = PLib.irk;

							if ((plusCount > 3) || (plusCount > 2 && asteriskCount > 2))
							{
								satInfo.visibility = '+';
							}
							else if (asteriskCount > 2)
							{
								satInfo.visibility = '*';
							}

							satInfoColl[arrIdx++] = satInfo;

							PLib.daynum += (1 / 24 / 6);
							PLib.daynum = PLib.FindAOS();
						} 
					}
				}
			}

			return satInfoColl;
		},

		configureGroundStation: function(lat, lng)
		{
			PLib.qth.stnlat = lat;

			if (lng < 0) PLib.qth.stnlong = -lng;
				else PLib.qth.stnlong = 360 - lng;

			PLib.obs_geodetic.lat = PLib.qth.stnlat * PLib.deg2rad;
			PLib.obs_geodetic.lon = -PLib.qth.stnlong * PLib.deg2rad;
			PLib.obs_geodetic.alt = PLib.qth.stnalt / 1000.0;
			PLib.obs_geodetic.theta = 0.0;
		}
	};

PLib.obs_geodetic = new PLib.geodetic_t();
PLib.tle = new PLib.tle_t();