Helping The others Realize The Advantages Of epoch sign in
Epoch as opposed to equinoxDate-references for coordinate systemsEpochs and intervals of validityChanging the standard equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian many years and J2000Epoch from the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal one-way linksThe main utilization of astronomical quantities