Next: , Previous: , Up: Internal Routines   [Contents][Index]

15.5.290 gmst06

gmst06(jdut, jdtt)

[SOFA] Returns Greenwich mean sidereal time in radians according to a model that is consistent with IAU 2006 precession. 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