UT0 is uncorrected; UT1 is corrected for the Chandler wobble; UT2 is corrected both for the Chandler wobble and for seasonal changes in Earth's rotation rate. [H76] ...
The initial values of universal time obtained at 75 observatories, denoted UT0, differ slightly because of polar motion. By adding a correction each observatory converts UT0 into UT1, which gives the Earth's rotational position in space.
1 second level, a local approximation to universal time not corrected for polar motion is often used. This is called UT0, and also referred to as Greenwich mean time, abbreviated GMT. In UT0, 24 universal hours are defined to be a mean solar day.
 See also: Universal Time, Earth, Second, Greenwich Mean Time, Time
  
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