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pn00b, jdtt, dpsi, deps, epsa,
rb, rp, rbp, rn, rbpn
[SOFA] Returns precession-nutation according to the IAU 2000B model
for the specified TT Julian Date jdtt and nutation in
longitude dpsi and obliquity deps, both in
radians. 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. dpsi,
deps, and epsa get 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