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Star Time |
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Calculates the star time
Unit moon_aux
function Star_Time(date:TDateTime): extended; function Mean_Star_Time(date:TDateTime): extended;
Description Converts the time to the apparent or mean siderial time (in degrees) at Greenwich. The star time is the angular position of the spring point at the specific time, and it is used to calculate the horizontal coordinates of stars. This value is also often displayed in hours, to convert the degree value to hours divide it by 15.
Do not confuse this star time with the one in Star Trek J.
Reference These functions are based upon chapter 12 (11) of "Astronomical Algorithms". |