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`pmat00(`

`jdtt`)

[SOFA] Returns the precession matrix (including frame bias) from GCRS
to a specified TT Julian Date

according to the IAU
2000 model. The result has the same dimensions as `jdtt`

except that two dimensions equal to 3 are prefixed. If the result is
`jdtt``rbp`

then `v(date) = rbp v(gcrs)`

where `v(gcrs)`

is a
p-vector with respect to the Geocentric Celestial Reference System and
`v(date)`

is a p-vector with respect to the mean equatorial triad
of the given date.

See also: Astronomical Coordinate Calculations