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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

. The output
parameters are the nutation in longitude in radians `jdtt`

,
the nutation in obliquity in radians `dpsi`

, 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`

,
`dpsi`

, and `deps`

get 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