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Engelsk forkortelse for Universal Time Coordinated - UTC corresponds exactly in rate with TAI but differs from it by an integral number of seconds. The UTC scale is adjusted by the insertion or deletion of seconds to ensure that departure of UTC from UT1 does not exceed 0.9 seconds..
De tillagte eller fratrukne sekunder kaldes for leap seconds.
UT0. Uncorrected Universal Time.
UT1. UT0 corrected for polar variation.
UT2. UT0 corrected for polar and seasonal variations.
[NP285/2002 p.XXVI, NAV1 p.166] Kilder |