Top epoch sign in Secrets
Epoch compared to equinoxDate-references for coordinate systemsEpochs and intervals of validityChanging the standard equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian many years and J2000Epoch in the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal hyperlinksThese representation of time is especially for inner us