Fascination About epoch sign in
Epoch versus equinoxDate-references for coordinate systemsEpochs and durations of validityChanging the conventional equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian yrs and J2000Epoch of the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal one-way linksThe most crucial usage of astronomical quantities laid out i