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Local sidereal time is the most useful form of sidereal time since it gives the right ascension of a
transiting celestial object at a given location. To compute the current local sidereal time LST, consult the
current Astronomical Almanac. Look up the "G. Sidereal Time (Apparent)" GST at midnight (0 h) in
the third column corresponding to the current date universal time. Let T be the current local 24-hour time,
and add  hours to convert from local time to Greenwich mean time.
Duffett-Smith, P. "Local Sidereal Time (LST)." §14 in Practical Astronomy with Your Calculator, 3rd ed.
Cambridge, England: Cambridge University Press, p. 20, 1992.
United States Government Printing Office. The Astronomical Almanac for the Year 2000.
Washington, DC: Navy Dept., Naval Observatory, Nautical Almanac Office, pp. B4-B15, 2000.
© 1996-2007 Eric W. Weisstein
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