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pmat76(jdtt)
[SOFA] Returns the precession matrix from J2000.0 to a specified TT
Julian Date jdtt according to the IAU 1976 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