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15.5.432 pmat00


[SOFA] Returns the precession matrix (including frame bias) from GCRS to a specified TT Julian Date jdtt according to the IAU 2000 model. The result has the same dimensions as jdtt except that two dimensions equal to 3 are prefixed. If the result is rbp then v(date) = rbp v(gcrs) where v(gcrs) is a p-vector with respect to the Geocentric Celestial Reference System and v(date) is a p-vector with respect to the mean equatorial triad of the given date.

See also: Astronomical Coordinate Calculations