DUT describes the difference between coordinated universal time (UTC) and universal time (UT) and is transmitted by some radio time signal services. Coordinated Universal Time or UTC, also sometimes referred to as Zulu time or Z, is an atomic realization of Universal Time (UT) or Greenwich Mean Time, the astronomical basis for civil time. ... Universal Time (UT) is a timescale based on the rotation of the Earth. ... A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. ...
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