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Universal Time ( UT or UT1) is a time standard based on Earth's rotation. [1] . While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult.
- DUT1
DUT1 (sometimes also written DUT) is a time correction equal...
- DUT1
Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce.
Universal Time (UT) is a solar time standard that reflects the average speed of the Earth's rotation. Learn about the different versions of UT, such as UT1, UT2, and UT0, and how they are measured by the stars and radio telescopes.
Aug 6, 2009 · Learn about the difference between UT1 and UTC, the astronomical and atomic time scales, and the leap seconds that adjust UTC to keep it within ±0.9 s of UT1. See the table of past and future leap seconds and the current UT1-UTC values from NIST and USNO.
Mar 22, 2023 · A user asks how UT1, the time based on Earth's rotation, is measured and calculated. Other users provide references and links to explain the concepts of celestial coordinates, Earth orientation, and time scales.
UT1, which gives the precise angular coordinate of the Earth about its spin axis, is obtained by correcting UT0 for the effects of polar motion. Finally, an empirical correction to take account of annual changes in the Earth’s speed of rotation is added to UT1 to convert it into UT2.
