WHAT DOES EPOCH SIGN IN MEAN?

Epoch as opposed to equinoxDate-references for coordinate systemsEpochs and durations of validityChanging the standard equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian several years and J2000Epoch from the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal inbound linksAstronomical portions is usually specified in