The beginning time for date and time calculations on UNIX systems The beginning of the epoch is 00: 00: 00 UTC, January 1, 1970
Measurement interval or data frequency, as in making observations every 15 seconds Loading data using 30-second epochs means loading every other measurement
A division of geologic time next shorter than a period Example: the Pleistocene epoch is in the Quaternary period
The presentation of the set of training (input and/or target) vectors to a network and the calculation of new weights and biases Note that training vectors can be presented one at a time or all together in a batch
Epoch signifies the beginning of an era (or event) or the reference date of a system of measurements
A short interval of arbitrarily defined length (usually 20-60 seconds) The sleep stage or state of each consecutive epoch within a bedrest episode is determined from the polygraphic sleep recording
A particular period of history, especially one considered remarkable or noteworthy
Epoch (ê´pòk´) noun 1 A fixed point of time, established in history by the occurrence of some grand or remarkable event 2 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 3 (Geology) A division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period
The coordinates commonly use for the celestial sphere, which are analogous to latitude and longitude for the Earth's surface, are called right ascension and declination The "prime meridian" of this system passes through the position of the Sun at the time of the vernal equinox Thus its position changes slowly over the years, due to the precession of the equinoxes The position of the celestial poles also changes with precession Thus, to locate an object from its right ascension and declination, you must also know the date for which those coordinates are valid; that date is called the epoch of the coordinates
Epoch specifies the time of a particular description of a satellite orbit See Keplerian elements
A precise moment in time which is specified alongside right ascension[?] and declination[?] to pinpoint an exact point in the sky Because the Earth's axis "wobbles" over a period of 26,000 years, Declination and RA coordinates don't technically make sense on their own
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 marked by distinctive character or reckoned from a fixed point or event