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c2txy(jdtt, x, y, xp, yp)
[SOFA] Returns the celestial-to-terrestrial matrix given the TT Julian
Date jd, the CIP coordinates x, y (the
x,y components of the unit vector in the Geocentric Celestial
Reference System), and the polar coordinates xp, yp
(the coordinates in radians of the Celestial Intermediate Pole with
respect to the International Terestrial Reference System, measured
along the meridians to 0 and 90 degrees west, respectively). All of
the arguments must have the same dimensions. The result has those
same dimensions, but with two dimensions equal to 3 prefixed.
See also: Astronomical Coordinate Calculations