Epoch

The word epoch can mean either an interval of time, or a particular point in time used as a reference point.

In common usage, the term is often used to apply to a period of time when significant related events took place. (see also: period, era)

In geology, the recent (to the geologist) past is divided into a series of epochs of a few million years each. See Geologic Timescale.

In computing, an epoch is a specific date and time used as the reference for all other times. The Unix epoch is an example.

In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. In the case of celestial coordinates, the position at other times can be computed by taking into account precession and proper motion. In the case of orbital elements, it is necessary to take account of perturbation by other bodies in order to calculate the orbital elements for a different time.

In telecommunication, an epoch date is a date in history, chosen as the reference date from which time is measured (see epoch date).

Common misspelling and questions (FAQ)

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Though all unworthy he to be my son, Nor crime of his nor wrath of mine shall ever move Ne'er vainly have I sued for pity from my sire! FELIX. To recount an act so fell my feeble words too weak, From her, thy maiden; she hath told thee all. PAUL. So taught by torture of his vilest friend, When of the frenzied race he sees the goal, Who mocked the thought of death, when death he views, That shadowy guest, that doth his soul entice, And that proud heart, which never meekness knew, What! Thinkest thou his soul can ever blench? FELIX. It might! It may!--I know such things can be! O, changeful Fortune! changeless Polyeucte move, My love too plain--myself too weakly kind, Nearchus' sin is his,--and yet the grace My duty--to a father's love betrayed A healing balm I bring for all thy fears, I give no thanks--no cause for thanks I find; They can blaspheme, but ah, they cannot lie! As bird in hand, he holds his pardon still. PAUL. He death escapes--if so he do elect. PAUL. Is't thus a father pleads for his own son? FELIX. He cannot see! FELIX. Who loves the darkness hateth still the light. PAUL. Nay, daughter, save thy breath; They hear our prayers-- .