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pn00a, jdtt, dpsi, deps, epsa,
rb, rp, rbp, rn, rbpn
[SOFA] Returns precession-nutation according to the IAU 2000A model
for the specified TT Julian Date jdtt. The output
parameters are the nutation in longitude in radians dpsi,
the nutation in obliquity in radians deps, 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