epoch sign in Fundamentals Explained
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 on the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal back linksThe leading use of astronomical quantities laid out in u