sdec              217 ext/date/lib/astro.c 	sdec,       /* Sun's declination */
sdec              249 ext/date/lib/astro.c 	astro_sun_RA_dec( d, &sRA, &sdec, &sr );
sdec              266 ext/date/lib/astro.c 		cost = (sind(altit) - sind(lat) * sind(sdec)) / (cosd(lat) * cosd(sdec));