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SiderealTime
MATLAB
[GMST, LST] = SiderealTime(JD,[Long])
Description

Converts the Julian date into Greenwich Mean & Local Mean Sidereal Time. Uses julian date format given in Seidelmann. Valid 1901-2199 AD.

Parameters
Parameters 
Description 
JD [array] 
Julian Date 
Long [array] 
Longitude position (deg) 
Return Values
Return Values 
Description 
GMST [array] 
Greenwich Mean Sidereal Time (deg) 
LST [array] 
(Optional) Local Mean Sidereal Time, defaults to 0 (deg) 
References

  • D. A. Vallado, Fundamentals of astrodynamics and applications. New York: McGraw-Hill, 1997.
  • The Astronomical Almanac (2013) U.S. Government Printing Office, 2012.

Examples

>> JD = Gregorian2Julian(now) 

>> [GMST, LST] = SiderealTime(JD, -84.0787) 

  • GMST and LST for current time in Dayton OH
 

See Also
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