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gmst00(jdut, jdtt)
[SOFA] Returns Greenwich mean sidereal time in radians according to a
model consistent with IAU 2000 resolutions. jdut is the
Julian Date (UT1). jdtt is the Julian Date (TT) of the
same instant. jdut is needed to predict the Earth
rotation, and TT to predict the effects of precession. If
jdtt is set equal to jdut then errors of
order 100 microarcseconds result. Both parameters must have the same
dimensions, and the result has those same dimensions, too.
See also: Astronomical Coordinate Calculations