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astronomisk tid
Tidsmling, der anvender den astronomiske dag som referenceramme, dss. vor almindelige tidsregning. —> astronomisk dag.
astronomical time.
[ATT] ordforklaring har flgende: " Time formerly used in astronomical calculations in which the day began at non rather than at midnight. The astronomical day commenced at noon of the civil day of the same date. Up to the close of 1924, was in general use in nautical almanacs. From 1925 the American Ephemeris and Nautical Almanac abandoned the astronomical time and adopted Greenwich civil (mean) time for the data given in their tables. "
[ATT, WOL]  Kilder