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Was (wer) ist UT1 - definition
TIME STANDARD BASED ON THE SLOWING ROTATION OF THE EARTH
Universal Standard Time; UT0; UT2; Ut1; UT1; UT1R; UT2R; UTC-SLS; Universal Time (UT); Universal time
Universal Time
<time, standard> (UT) The mean solar time along the prime
meridian (0 longitude) that runs through the Greenwich
Observatory outside of London, UK, where the current system
originated. UT is tied to the rotation of the Earth in
respect to the fictitious "mean Sun".
Greenwich Mean Time (GMT) was measured from Greenwich mean
midday until 1925 when the reference point was changed from
noon to midnight and the name changed to "Universal Time".
There are three separate definitions, UT0, UT1, and UT2,
depending on which corrections have been applied to the
Earth's motion. Coordinated Universal Time is kept within
0.9 seconds of UT1, by addition of leap seconds to
International Atomic Time.
(2001-08-02)
Universal Time
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult.
Universal Time
¦ noun Greenwich Mean Time, as used internationally.
Wikipedia
Universal Time
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle (ERA, which serves as a modern replacement for Greenwich Mean Sidereal Time). UT1 is the same everywhere on Earth. UT1 is required to follow the relationship
- ERA = 2π(0.7790572732640 + 1.00273781191135448 · Tu) radians
where Tu = (Julian UT1 date - 2451545.0).
