Astronomy Answers
From the Astronomical Dictionary


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The description of the word you requested from the astronomical dictionary is given below.

UTC

UTC means "Coordinated Universal Time" and is the time that belongs to the meridian of 0° on Earth. Each UTC second lasts exactly as long as all other ones (namely exactly as long as the second from the International System of Units). UTC is kept synchronized with the somewhat irregular rotation of the Earth by occasionally inserting a leap second as needed.