sidtime           221 ext/date/lib/astro.c 	sidtime;    /* Local sidereal time */
sidtime           246 ext/date/lib/astro.c 	sidtime = astro_revolution(astro_GMST0(d) + 180.0 + lon);
sidtime           252 ext/date/lib/astro.c 	tsouth = 12.0 - astro_rev180(sidtime - sRA) / 15.0;