Barger, Vernon D. Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin.
Last reviewed:December 2020
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- As a concept in physics
- Sidereal time
- Solar time
- Universal Time (UT)
- Dynamical time
- Civil and standard times
- Related Primary Literature
- Additional Reading
The dimension of the physical universe that orders the sequence of events at a given place; also, a designated instant in this sequence, such as the time of day, technically known as an epoch, or sometimes as an instant. While time is objectively measurable and quantifiable (Fig. 1), the dimension of time as a fundamental phenomenon and/or property of the universe remains a source of great debate in theoretical physics. This article will first briefly explore that debate and then address practical matters of time measurement and timekeeping. See also: Physics; Theoretical physics; Universe
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