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pn00, jdtt, dpsi, deps, epsa,
rb, rp, rbp, rn, rbpn
[SOFA] Returns precession-nutation according to the IAU 2000 model for
the specified TT Julian Date jdtt and nutation in
longitude dpsi and obliquity deps, both in
radians. The nutation values must be with respect to the equinox and
ecliptic of date. The output parameters are the mean obliquity
epsa, the frame bias matrix rb, the
precession matrix rp, the bias-precession matrix
rbp, the nutation matrix rn, and the
GCRS-to-true matrix rbpn. epsa gets the
same dimensions as jdtt. The remaining output variables
get those same dimensions plus two extra dimensions equal to 3
prefixed.
See also: Astronomical Coordinate Calculations