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`c2txy(`

`jdtt`, `x`, `y`, `xp`, `yp`)

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

, the CIP coordinates `jd`

(the
x,y components of the unit vector in the Geocentric Celestial
Reference System), and the polar coordinates `x`, `y`

(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.
`xp`, `yp`

See also: Astronomical Coordinate Calculations