Glossary
Universal Time (UT1)
Universal Time (UT1)
Acronym: UT1
In French: Temps universelUT1 is the rotation angle about the Earth pole.
UT1 can be regarded as a time determined by the rotation of the Earth. It is distributed by the IERS as the difference UT1-UTC in IERS Bulletins A and B and in other data files.
Universal Time (UT) is counted from 0 hours at midnight. The unit of duration is the mean solar day.
UT0 is the rotational time of a particular place of observation.
UT1 is computed by correcting UT0 for the effect of polar motion on the longitude of the observing site.
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