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`pmat76(`

`jdtt`)

[SOFA] Returns the precession matrix from J2000.0 to a specified TT
Julian Date

according to the IAU 1976 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