Import sources from 2011-03-30 iso image

1 files changed, 67 insertions, 0 deletions

diff --git a/sys/src/cmd/astro/mars.c b/sys/src/cmd/astro/mars.c
new file mode 100755
index 000000000..327ab8d22
--- /dev/null
+++ b/sys/src/cmd/astro/mars.c
@@ -0,0 +1,67 @@
+#include "astro.h"
+
+void
+mars(void)
+{
+	double pturbl, pturbb, pturbr;
+	double lograd;
+	double dele, enom, vnom, nd, sl;
+	double lsun, elong, ci, dlong;
+
+
+	ecc = .09331290 + .000092064*capt;
+	incl = 1.850333 - 6.75e-4*capt;
+	node = 48.786442 + .770992*capt;
+	argp = 334.218203 + 1.840758*capt + 1.30e-4*capt2;
+	mrad = 1.5236915;
+	anom = 319.529425 + .5240207666*eday + 1.808e-4*capt2;
+	motion = 0.5240711638;
+
+
+	incl = incl*radian;
+	node = node*radian;
+	argp = argp*radian;
+	anom = fmod(anom,360.)*radian;
+
+	enom = anom + ecc*sin(anom);
+	do {
+		dele = (anom - enom + ecc * sin(enom)) /
+			(1. - ecc*cos(enom));
+		enom += dele;
+	} while(fabs(dele) > converge);
+	vnom = 2.*atan2(sqrt((1.+ecc)/(1.-ecc))*sin(enom/2.),cos(enom/2.));
+	rad = mrad*(1. - ecc*cos(enom));
+
+	lambda = vnom + argp;
+	pturbl = 0.;
+	lambda = lambda + pturbl*radsec;
+	pturbb = 0.;
+	pturbr = 0.;
+
+/*
+ *	reduce to the ecliptic
+ */
+
+	nd = lambda - node;
+	lambda = node + atan2(sin(nd)*cos(incl),cos(nd));
+
+	sl = sin(incl)*sin(nd) + pturbb*radsec;
+	beta = atan2(sl, pyth(sl));
+
+	lograd = pturbr*2.30258509;
+	rad *= 1. + lograd;
+
+
+	motion *= radian*mrad*mrad/(rad*rad);
+	semi = 4.68;
+
+	lsun = 99.696678 + 0.9856473354*eday;
+	lsun *= radian;
+	elong = lambda - lsun;
+	ci = (rad - cos(elong))/sqrt(1. + rad*rad - 2.*rad*cos(elong));
+	dlong = atan2(pyth(ci), ci)/radian;
+	mag = -1.30 + .01486*dlong;
+
+	helio();
+	geo();
+}