Epoch
nounverified·updated May 18, 2026
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
Framework senses
- §1
- a unit of geological time that is a subdivision of a period and is itself divided into ages
- §2
- a period marked by distinctive character or reckoned from a fixed point or event
- §3
- (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
- §1 · legacy_primary
- (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recordedDR-088 backfill from the noun definition column