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15.5.299 gst06

gst06(jdut, jdtt, rnpb)

[SOFA] Returns Greenwich apparent sidereal time in radians consistent with IAU 2006 resolutions, given the nutation-precession-bias matrix rnpb. 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. jdut and jdtt must have the same dimensions. rnpb must have those dimensions, too, with two extra dimensions equal to 3 prefixed. The result has the same dimensions as jdut.

See also: Astronomical Coordinate Calculations