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Bible Encyclopedias
Epoch
1911 Encyclopedia Britannica
or (Gr. eiroXi, holding in suspense, a pause, from 7rExtu', to hold up, to stop), a term for a stated period of time, and so used of a date accepted as the starting-point of an era or of a new period in chronology, such as the birth of Christ. It is hence transferred to a period which marks a great change, whether in the history of a country or a science, such as a great discovery or invention. Thus an event may be spoken of as "epoch-making." The word is also used, synonymously with "period," for any space of time marked by a distinctive condition or by a particular series of events.
In astronomy the word is used for a moment from which time is measured, or at which a definite position of a body or a definite relation of two bodies occurs. For example, the position of a body moving in an orbit cannot be determined unless its position at some given time is known. The given time is then the epoch; but the term is often applied to the mean longitude of the body at the given time.
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Chisholm, Hugh, General Editor. Entry for 'Epoch'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/e/epoch.html. 1910.
