1. epochAstronomy
2. Epoch (astronomy)In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as celestial coordinates, or elliptical orbital elements of a celestial body, where these are (as usual) subject to perturbations and vary with time.
Read “Epoch (astronomy)” on English Wikipedia
Read “元期” on Japanese Wikipedia
Read “Epoch (astronomy)” on DBpedia
Read “Epoch (astronomy)” on English Wikipedia
Read “元期” on Japanese Wikipedia
Read “Epoch (astronomy)” on DBpedia
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