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What is universal time (UT), and what is it used for?

April 26, 2017co-latitude latitude line line of latitude longitude Meridian time universal Used ut

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What is universal time (UT), and what is it used for?

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Universal time, UT, is the local time at Greenwich, England, and anywhere else on the “Prime Meridian” of zero longitude. It is used when a single world-wide time system is needed, e.g. in timing events observed by a scientific spacecraft, or eruptions on the Sun.