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(A) Universal Time $(UT)$ is a time standard based on the Earth's rotation on its axis. It is determined by observing the positions of celestial bodie

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Rotation of the Earth on its axis

Vedclass · Answer

(A) Universal Time $(UT)$ is a time standard based on the Earth's rotation on its axis. It is determined by observing the positions of celestial bodies or by very long baseline interferometry. In contrast, Coordinated Universal Time $(UTC)$ is the primary time standard by which the world regulates clocks and time, and it is based on the vibrations of the cesium-$133$ atom.

Universal Time $(UT)$ is based on:

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