- an arbitrarily fixed instant of time or date, usually the beginning of a century or half century, used as a reference in giving the elements of a planetary orbit or the like.
- the mean longitude of a planet as seen from the sun at such an instant or date.
Origin of epoch
Examples from the Web for epoch
At the same time, it is the hallmark of brilliant people whatever their civilization, epoch, or area of expertise.
As I said, Balzac wrote about an epoch that is curiously like our own.
Prague Fatale is authentic because Kerr can muffle the horror of this epoch in dramatic irony but he can also shout it out loud.Must Read Fiction: ‘Prague Fatale,’ ‘Derby Day’ and More|Malcolm Forbes, Hillary Kelly, Mythili Rao|May 9, 2012|DAILY BEAST
First scholar and divine of his epoch, he was also the heaven-born dramatist of his century.The Cloister and the Hearth|Charles Reade
The given time is then the epoch; but the term is often applied to the mean longitude of the body at the given time.
This epoch, when grass grew even in High Street, long lingered in the popular memory as the “dark age.”
His innovations in the manufacture of arms formed as great an epoch in mechanical history as had his invention of the cotton gin.
For my part, I was absorbed for these moments in a threatened mishap to my harness, and the dread of disgrace at such an epoch.In the Ranks of the C.I.V.|Erskine Childers