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`c2t00a(`

`jdtt`, `jdut`, `xp`, `yp`)

[SOFA] Returns the celestial-to-terrestrial matrix, given TT Julian
Date

, UT1 Julian Date `jdtt`

, and polar
coordinates `jdut`

, `xp`

, using the IAU 2000A
nutation model.
`yp`

and `jdtt`

should express the same
instants of time: the first one in the TT timescale, and the second
one in the UT1 timescale. `jdut`

are the
coordinates (in radians) of the Celestial Intermediate Pole with
respect to the International Terrestrial Reference System measured
along the meridians to 0 and 90 degrees west, respectively, for those
same instants. All four arguments must have the same dimensions.
`xp`, `yp`

The result gets the same dimensions as all of the parameters, with two dimensions equal to 3 prefixed.

`c2t00b`

yields slightly less accurate results, but faster.

See also: c2t00b, c2t06a, Astronomical Coordinate Calculations