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See also:EPOCH (Gr. E7roxij, holding in suspense, a pause, from E1rxav, to hold up, to stop) , a See also:term for a stated See also:period of See also:time, and so used of a date accepted as the starting-point of an era or of a new period in See also:chronology, such as the See also:birth of See also:Christ . It is hence transferred to a period which marks a See also:great See also:change, whether in the See also:history of a See also:country or a See also:science, such as a great See also:discovery or invention . Thus an event may be spoken of as " See also:epoch-making." The word is also used, synonymously with " period," for any space of time marked by a distinctive See also:condition or by a particular See also:series of events . In See also:astronomy the word is used for a moment from which time is measured, or at which a definite position of a See also:body or a definite relation of two bodies occurs . For example, the position of a body moving in an See also: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 See also:longitude of the body at the given time . |
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