Universal Time (UT) is a time standard based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the Prime Meridian at Greenwich, and GMT is sometimes used loosely as a synonym for UTC. In fact, the expression "Universal Time" is ambiguous, as there are several versions of it, the most commonly used being UTC and UT1 (see below). All of these versions of UT are based on the rotation of the Earth in relation to distant celestial objects (stars and quasars), but with a scaling factor and other adjustments to make them closer to solar time.
Read more about Universal Time: Universal Time and Standard Time, Measurement, Versions
Famous quotes containing the words universal and/or time:
“There is a universal truth that I have found in my work. Everybody longs to be loved. And the greatest thing we can do is let somebody know that they are loved and capable of loving.”
—Fred Rogers (20th century)
“Shorten my days thou canst with sullen sorrow,
And pluck nights from me, but not lend a morrow;
Thou canst help time to furrow me with age,
But stop no wrinkle in his pilgrimage.”
—William Shakespeare (1564–1616)