Not known Details About epoch sign in
Epoch vs . equinoxDate-references for coordinate systemsEpochs and durations of validityChanging the standard equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian yrs and J2000Epoch with the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal one-way linksSo, some stellar positions read through from the star atlas or c