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xys00a, jdtt, x, y, s
[SOFA] Returns the Celestial Intermediate Pole x,
y coordinates and the CIO locator s (in
radians) for TT Julian Date jdtt, based on the IAU 2000A
precession-nutation model. 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. The CIO
locator positions the Celestial Intermediate Origin on the equator of
the CIP.
See also: Astronomical Coordinate Calculations