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xys06a, jdtt, x, y, s
[SOFA] Returns the Celestial Intermediate Pole x,
y coordinates and the CIO locator s for TT
Julian Date jd, based on the IAU 2006 precession and IAU
2000A nutation models. 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