Epoch

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Depending on context, epoch can refer to:

Period of time

epoch (reference date) - a significant event, time, or moment which is chosen as a new origin for time measurements, usually as the delimiting factor of an era.

* January 1 1970 is called the epoch in Linux and BSD in this sense. See Unix time.

epoch (astronomy) - a precise moment in time for which celestial coordinates or orbital elements are specified

Epoch (magazine), the literary magazine of Cornell University.
Epoch (film), a science fiction film directed by Matt Codd
Epoch Game Pocket Computer, an early hand-held game console
Epoch Co., the maker of the above and other computer games
Epoch (Chrono Trigger), a flying time machine in role-playing game Chrono Trigger
Epoch (DC Comics), a supervillain also known as the Lord of Time
Epoch (Marvel Comics), a cosmic entity in the Marvel Comics universe.
Epoch Hunter (World of Warcraft), a boss in World of Warcraft's Caverns of Time; Old Hillsbrad Foothills.
The Epoch Times, a privately owned Falun Gong-linked newspaper
Epoch Javascript Calendar is an open source, GPL calendar component for use in web pages written in JavaScript.
Epoch operating system was a European research project in the 1990s to build an operating system based on the ChorusOS operating system kernel.