mean equator and equinox

The reference system determined by ignoring small variations of short period in the motions of the celestial equator; it is affected only by precession. Positions in star catalogs are now usually referred to the mean catalog equator and equinox (see catalog equinox) of a standard epoch. The coordinates of a celestial body on the (Sun-centered) celestial sphere, referred to the mean equator and equinox of a standard epoch, are its mean place. See also true equator and equinox.

单词	mean equator and equinox
释义	mean equator and equinox mean equator and equinox The reference system determined by ignoring small variations of short period in the motions of the celestial equator; it is affected only by precession. Positions in star catalogs are now usually referred to the mean catalog equator and equinox (see catalog equinox) of a standard epoch. The coordinates of a celestial body on the (Sun-centered) celestial sphere, referred to the mean equator and equinox of a standard epoch, are its mean place. See also true equator and equinox.
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