1 #include "astro.h"
2 
3 void
4 mars(void)
5 {
6 	double pturbl, pturbb, pturbr;
7 	double lograd;
8 	double dele, enom, vnom, nd, sl;
9 	double lsun, elong, ci, dlong;
10 
11 
12 	ecc = .09331290 + .000092064*capt;
13 	incl = 1.850333 - 6.75e-4*capt;
14 	node = 48.786442 + .770992*capt;
15 	argp = 334.218203 + 1.840758*capt + 1.30e-4*capt2;
16 	mrad = 1.5236915;
17 	anom = 319.529425 + .5240207666*eday + 1.808e-4*capt2;
18 	motion = 0.5240711638;
19 
20 
21 	incl = incl*radian;
22 	node = node*radian;
23 	argp = argp*radian;
24 	anom = fmod(anom,360.)*radian;
25 
26 	enom = anom + ecc*sin(anom);
27 	do {
28 		dele = (anom - enom + ecc * sin(enom)) /
29 			(1. - ecc*cos(enom));
30 		enom += dele;
31 	} while(fabs(dele) > converge);
32 	vnom = 2.*atan2(sqrt((1.+ecc)/(1.-ecc))*sin(enom/2.),cos(enom/2.));
33 	rad = mrad*(1. - ecc*cos(enom));
34 
35 	lambda = vnom + argp;
36 	pturbl = 0.;
37 	lambda = lambda + pturbl*radsec;
38 	pturbb = 0.;
39 	pturbr = 0.;
40 
41 /*
42  *	reduce to the ecliptic
43  */
44 
45 	nd = lambda - node;
46 	lambda = node + atan2(sin(nd)*cos(incl),cos(nd));
47 
48 	sl = sin(incl)*sin(nd) + pturbb*radsec;
49 	beta = atan2(sl, pyth(sl));
50 
51 	lograd = pturbr*2.30258509;
52 	rad *= 1. + lograd;
53 
54 
55 	motion *= radian*mrad*mrad/(rad*rad);
56 	semi = 4.68;
57 
58 	lsun = 99.696678 + 0.9856473354*eday;
59 	lsun *= radian;
60 	elong = lambda - lsun;
61 	ci = (rad - cos(elong))/sqrt(1. + rad*rad - 2.*rad*cos(elong));
62 	dlong = atan2(pyth(ci), ci)/radian;
63 	mag = -1.30 + .01486*dlong;
64 
65 	helio();
66 	geo();
67 }