SOFA software support for IAU 2000
SOFA software support for IAU 2000 Patrick Wallace Rutherford Appleton Laboratory, UK ... Precession, nutation ... zero-point for RA, namely the CEO in place of the equinox. Note the clean separation between Earth rotation and precession-nutation in the new system.
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SOFA Tools for Earth Attitude
www.iausofa.org4 2 CELESTIAL COORDINATES The precession of the ecliptic is caused by the in uence on the Earth’s orbital motion of the tidal forces from the planets. The ff is a slow (0 ′′:5 per year) secular rotation of the ecliptic about a slowly-moving diameter.
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