UT1 - significado y definición. Qué es UT1
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Qué (quién) es UT1 - definición

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
  • An 1853 "Universal Dial Plate" showing the relative times of "all nations" before the adoption of 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).