Epoch

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4545.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4545. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Positional Concepts

Scientific paper

A particular instant of time used for reference purposes. In the context of the measurement of stellar positions, the epoch of observation is the date on which the observational data were obtained. A catalog for the epoch 2000.0, for example, would list positions, valid for that date. To obtain positions at some other epoch, the effects of proper motion must be calculated. Other effects such as n...

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