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J2000.0 Equinox

(equinox as of the J2000.0 epoch used as a positional reference)

J2000.0 Equinox is a standard Equinox used as a reference in astronomy, being the position of the equinox as of Epoch J2000.0. It is used as a reference for Right Ascension and Declination coordinates.

Like the standard Epoch, previous standard equinoxes have been used, generally near in time to the reports/Catalogs. For example, prior to J2000.0 Equinox, the B1950.0 Equinox (similarly based on Epoch B1950.0) was used.


(astronomy,designation)
http://en.wikipedia.org/wiki/Equinox_(celestial_coordinates)

Referenced by:
Equinox
J Designator

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