obl_ecl           162 ext/date/lib/astro.c 	double lon, obl_ecl, x, y, z;
obl_ecl           172 ext/date/lib/astro.c 	obl_ecl = 23.4393 - 3.563E-7 * d;
obl_ecl           175 ext/date/lib/astro.c 	z = y * sind(obl_ecl);
obl_ecl           176 ext/date/lib/astro.c 	y = y * cosd(obl_ecl);