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eqeq94(jdtdb)
[SOFA] Returns the equation of the equinoxes for the given TDB Julian
Date jdtdb, according to the IAU 1994 model. The result
has the same dimensions as jdtdb.
Greenwich apparent sidereal time (gast) is equal to Greenwish mean sidereal time (gmst) plus the equation of the equinoxes.
See also: Astronomical Coordinate Calculations