Little Known Facts About epoch sign in.
Epoch versus equinoxDate-references for coordinate systemsEpochs and intervals of validityChanging the conventional equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian a long time and J2000Epoch with the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal backlinksThe primary usage of astronomical portions specified i