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#include "astro.h"
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void
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merc(void)
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{
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	double pturbl, pturbr;
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	double lograd;
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	double dele, enom, vnom, nd, sl;
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	double q0, v0, t0, j0 , s0;
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	double lsun, elong, ci, dlong;
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	ecc = .20561421 + .00002046*capt - 0.03e-6*capt2;
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	incl = 7.0028806 + .0018608*capt - 18.3e-6*capt2;
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	node = 47.145944 + 1.185208*capt + .0001739*capt2;
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	argp = 75.899697 + 1.555490*capt + .0002947*capt2;
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	mrad = .3870986;
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	anom = 102.279381 + 4.0923344364*eday + 6.7e-6*capt2;
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	motion = 4.0923770233;
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	q0 = 102.28  + 4.092334429*eday;
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	v0 = 212.536 + 1.602126105*eday;
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	t0 = -1.45  + .985604737*eday;
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	j0 = 225.36 + .083086735*eday;
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	s0 = 175.68 + .033455441*eday;
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	q0 *= radian;
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	v0 *= radian;
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	t0 *= radian;
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	j0 *= radian;
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	s0 *= radian;
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	incl *= radian;
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	node *= radian;
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	argp *= radian;
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	anom = fmod(anom, 360.)*radian;
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	enom = anom + ecc*sin(anom);
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	do {
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		dele = (anom - enom + ecc * sin(enom)) /
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			(1. - ecc*cos(enom));
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		enom += dele;
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	} while(fabs(dele) > converge);
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	vnom = 2.*atan2(sqrt((1.+ecc)/(1.-ecc))*sin(enom/2.),
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			cos(enom/2.));
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	rad = mrad*(1. - ecc*cos(enom));
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	icosadd(mercfp, merccp);
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	pturbl =  cosadd(2, q0, -v0);
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	pturbl += cosadd(2, q0, -t0);
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	pturbl += cosadd(2, q0, -j0);
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	pturbl += cosadd(2, q0, -s0);
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	pturbr =  cosadd(2, q0, -v0);
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	pturbr += cosadd(2, q0, -t0);
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	pturbr += cosadd(2, q0, -j0);
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/*
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 *	reduce to the ecliptic
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 */
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	lambda = vnom + argp + pturbl*radsec;
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	nd = lambda - node;
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	lambda = node + atan2(sin(nd)*cos(incl), cos(nd));
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	sl = sin(incl)*sin(nd);
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	beta = atan2(sl, pyth(sl));
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	lograd = pturbr*2.30258509;
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	rad *= 1. + lograd;
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	motion *= radian*mrad*mrad/(rad*rad);
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	semi = 3.34;
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	lsun = 99.696678 + 0.9856473354*eday;
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	lsun *= radian;
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	elong = lambda - lsun;
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	ci = (rad - cos(elong))/sqrt(1. + rad*rad - 2.*rad*cos(elong));
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	dlong = atan2(pyth(ci), ci)/radian;
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	mag = -.003 + .01815*dlong + .0001023*dlong*dlong;
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	helio();
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	geo();
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}