Tools Astrocalculator The &kstars; Astrocalculator provides several modules that give you direct access to algorithms used by the program. The modules are organised by subject: Angular Distance Apparent Coordinates Ecliptic Coordinates Equatorial/Galactic Coordinates Horizontal Coordinates Precession Geodetic Coordinates Planets Coordinates Day Duration Equinoxes and Solstices Julian Day Sidereal Time &calc-angdist; &calc-apcoords; &calc-ecliptic; &calc-eqgal; &calc-horiz; &calc-precess; &calc-geodetic; &calc-planetcoords; &calc-dayduration; &calc-equinox; &calc-julian; &calc-sidereal;