Julian Date/Time. The basis for all calculations Your Latitude. North of the equator is positive. South is negative. San Diego is at 32.9 degrees north Lat Your Longitude. The sign indicates West(-) or East(+) of Greenwich. San Diego is -117 deg. Local Sidereal Time Open Mount Dialog Julian Date/Time. The basis for all calculations Coordinated Universal Time. The time that WWV reports Open SkyMap Dialog Calculated Star Az/El Greenwich Sidereal Time. Measured with respect to the apparent motion of the stars Star Location in Declination and Right Ascension