Not known Details About epoch sign in
Epoch versus equinoxDate-references for coordinate systemsEpochs and durations of validityChanging the common equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian yrs and J2000Epoch in the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal hyperlinksSo, some stellar positions read through from the star atlas or catalo