bn:00025347n
Noun Concept
Categories: Astronomical epochs, Articles with short description, Articles with permanently dead external links
EN
epoch  date of reference  1875.0  1900.0  1950.0
EN
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded WordNet 3.0
astronomy
Definitions
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EN
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded WordNet 3.0 & Open English WordNet
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. Wikipedia
A moment in time used as a reference for the orbital elements of a celestial body Wikipedia Disambiguation
Moment in time used as a reference point for some time-varying astronomical quantity Wikidata
Moment in history which is usually marked by some significant event. OmegaWiki
A precise instant of time that is used as a point of reference. Wiktionary
( astronomy) time reference point. Wiktionary (translation)