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15.5.438 pn00b

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