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15.5.557 siderealtime

siderealtime( jd [, /atzerotime] [, /mean])

Returns the sidereal time (relative to the mean equinox of the date) for 0 degrees longitude, measured in hours (between 0 and 24), for Julian Day numbers jd (a numerical scalar or array). If /atzerotime is specified, then the sidereal time is returned for the beginning (0:00 UT) of the Julian Day that jd indicates. Otherwise, the mean sidereal time at the exact date and time indicated by jd is returned. If /mean is specified, then the mean sidereal time is returned, otherwise the true sidereal time.

See also: calendar