date of reference

English Thesaurus

1. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded (noun.time)

hypernym	:	date,
definition	:	the particular day, month, or year (usually according to the Gregorian calendar) that an event occurred (noun.time)

domain category	:	astronomy, uranology,
definition	:	the branch of physics that studies celestial bodies and the universe as a whole (noun.cognition)

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