Research topic:epoch

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Find more facts and information on our topic page about epoch

epoch

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

epoch The date and time at which an astronomical observation was made, or the date for which positions of celestial objects and orbital elements are calculated. Because of precession and nutation, celestial coordinates change with time, so that positions of celestial objects must be referred to a given date. The standard epoch now commonly used in ephemerides and star catalogues is 2000January1, 12 h (written as 2000.0).

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