The Basic Principles Of epoch sign in
Epoch as opposed to equinoxDate-references for coordinate systemsEpochs and intervals of validityChanging the normal equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian a long time and J2000Epoch from the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal backlinksAstronomical portions could be specified in any of qu