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15.5.827 xy06

xy06, jdtt, x, y

[SOFA] Returns the Celestial Intermediate Pole x, y coordinates for the given TT Julian Date jdtt, based on IAU 2006 precession and IAU 2000A nutation. The output variables have the same dimensions as jdtt.

The x and y coordinates are those of the unit vector towards the celestial intermediate pole. They represent the combined effects of frame bias, precession, and nutation.

See also: Astronomical Coordinate Calculations