Universal Time (UT), also known as Coordinated Universal Time (UTC), is a specific time standard that serves as the basis for civil timekeeping worldwide. It is a coordinated universal clock that keeps track of the Earth's rotation and has been adopted as the official time standard by many countries.
Key Points:
- Mean Solar Time: UT is derived from the average of the sun's apparent position at noon in the Earth's atmosphere.
- Time Zone Differences: Different parts of the world have different time zones, which offset UT by various hours.
- Universal Day and Night: UT has a constant day and night cycle, with the sun rising at the same time each day.
- Reference Point: UT is referenced to the prime meridian (0 longitude) in London, UK.
- Scientific and Military Use: UT is widely used in science, navigation, and military operations for its accuracy and consistency.
- Civil Time: UT is not directly used for civil purposes in most countries, but it is used as the basis for setting and synchronizing clocks.
- Gregorian Calendar: UT is coordinated with the Gregorian calendar, which is used to track the dates and months of the year.
- ISO 8601: UT is commonly expressed in the ISO 8601 format, such as "2023-08-09T12:00:00Z."
- Atomic Clocks: UT is maintained by atomic clocks, which provide the most precise timekeeping available.
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