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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

and nutation in
longitude `jdtt`

and obliquity `dpsi`

, both in
radians. The nutation values must be with respect to the equinox and
ecliptic of date. The output parameters are the mean obliquity
`deps`

, the frame bias matrix `epsa`

, the
precession matrix `rb`

, the bias-precession matrix
`rp`

, the nutation matrix `rbp`

, and the
GCRS-to-true matrix `rn`

. `rbpn`

gets the
same dimensions as `epsa`

. The remaining output variables
get those same dimensions plus two extra dimensions equal to 3
prefixed.
`jdtt`

See also: Astronomical Coordinate Calculations