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c2t06a(jdtt, jdut, xp, yp)
[SOFA] Returns the celestial-to-terrestrial matrix, given TT Julian
Date jdtt, UT1 Julian Date jdut, and polar
coordinates xp, yp, using the IAU 2006
precession model and IAU 2000A nutation model.
jdtt and jdut should express the same
instants of time: the first one in the TT timescale, and the second
one in the UT1 timescale. x, y 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.
The result gets the same dimensions as all of the parameters, with two dimensions equal to 3 prefixed.
See also: c2t00a, c2t00b, Astronomical Coordinate Calculations