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pmat06(jdtt)
[SOFA] Returns the precession matrix (including frame bias) from GCRS
to a specified TT Julian Date jdtt according to the IAU
2006 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