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Precession of the Equinox - Binary Research Institute
www.binaryresearchinstitute.orgPrecession of the equinox is the phenomenon whereby the sun on the day of the equinox (that day when the day and night are of equal length) rises in different
SOFA software support for IAU 2000
www.iausofa.orgSOFA 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.