The Basic Principles Of epoch sign in
Epoch compared to equinoxDate-references for coordinate systemsEpochs and intervals of validityChanging the common equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian a long time and J2000Epoch of the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal one-way linksAstronomical portions is usually specified in any of