Definitions for EPOCHˈɛp ək; esp. Brit. ˈi pɒk
This page provides all possible meanings and translations of the word EPOCH
a period marked by distinctive character or reckoned from a fixed point or event
epoch, date of reference(noun)
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
a unit of geological time that is a subdivision of a period and is itself divided into ages
A particular period of history, especially one considered remarkable or noteworthy.
A notable event which marks the beginning of such a period.
A precise instant of time that is used as a reference point.
A precise instant of time that is used as a reference point (e.g. January 1, 1970, 00:00:00 UTC).
a fixed point of time, established in history by the occurrence of some grand or remarkable event; a point of time marked by an event of great subsequent influence; as, the epoch of the creation; the birth of Christ was the epoch which gave rise to the Christian era
a period of time, longer or shorter, remarkable for events of great subsequent influence; a memorable period; as, the epoch of maritime discovery, or of the Reformation
a division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period
the date at which a planet or comet has a longitude or position
an arbitrary fixed date, for which the elements used in computing the place of a planet, or other heavenly body, at any other date, are given; as, the epoch of Mars; lunar elements for the epoch March 1st, 1860
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics can be used to generate an ephemeris, a table of values giving the positions and velocities of astronomical objects in the sky at a given time or times. Astronomical quantities can be specified in any of several ways, for example, as a polynomial function of the time-interval, with an epoch as a temporal point of origin. Alternatively, the time-varying astronomical quantity can be expressed as a constant, equal to the measure that it had at the epoch, leaving its variation over time to be specified in some other way—for example, by a table, as was common during the 17th and 18th centuries.
The New Hacker's Dictionary
[Unix: prob.: from astronomical timekeeping] The time and date corresponding to 0 in an operating system's clock and timestamp values. Under most Unix versions the epoch is 00:00:00 GMT, January 1, 1970; under VMS, it's 00:00:00 of November 17, 1858 (base date of the U.S. Naval Observatory's ephemerides); on a Macintosh, it's the midnight beginning January 1 1904. System time is measured in seconds or ticks past the epoch. Weird problems may ensue when the clock wraps around (see wrap around), which is not necessarily a rare event; on systems counting 10 ticks per second, a signed 32-bit count of ticks is good only for 6.8 years. The 1-tick-per-second clock of Unix is good only until January 18, 2038, assuming at least some software continues to consider it signed and that word lengths don't increase by then. See also wall time. Microsoft Windows, on the other hand, has an epoch problem every 49.7 days — but this is seldom noticed as Windows is almost incapable of staying up continuously for that long.
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Translations for EPOCH
From our Multilingual Translation Dictionary
- زمان, عصور, عصرArabic
- èpocaCatalan, Valencian
- Epoche, ÄraGerman
- aikakausi, ajanjakso, käännekohta, epookkiFinnish
- époque, singularité, évènement, ère, période, monetoFrench
- դար, դարաշրջանArmenian
- avvenimento, singolarità, epoca, orario epocaleItalian
- época, eraPortuguese
- epocă, erăRomanian
- эпоха, эраRussian
- devir, çağTurkish
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