A REVIEW OF EPOCH TIMES DEUTSCH

If some time big difference is small, then pretty simple and little corrections for the precession may perhaps suffice. If some time difference receives significant, then fuller plus much more precise corrections needs to be applied. For that reason, a star position go through from the star atlas or catalog depending on a sufficiently aged equinox

Epoch (geology), a span of time over the geologic time scale shorter than a period of time and more time than an ageIn astronomy, an epoch (or sometimes epochal instant) is actually a second in time for which the position or even the orbital features of a celestial physique are specified.As a result of precession and good movement, star information