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Astronomical day

   Also found in: Encyclopedia 0.01 sec.
See under Day.
a period equal to the mean solar day, but beginning at noon instead of at midnight, its twenty-four hours being numbered from 1 to 24; also, the sidereal day, as that most used by astronomers.

See also: Astronomical Day



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to bring the most accurate atomic clocks in line with the astronomical day.
Bright start to world in 2009; (1) AUSTRALIA The skys alight: ... by The Daily Mail (London, England)
Thanks to the Earth's erratic rotation, the countdown to 2009 lasted a moment longer as British physicists and official timekeepers around the world inserted a leap second to bring the most accurate atomic clocks in line with the astronomical day.
Sydney's pyrotechnic spectacular is first by The Journal (Newcastle, England)
Each astronomical day, then, is actually defined as 24 hours and three one-thousandths of a second.
Leaping to conclusions Today is your typical once-in-400-years event by Ramirez, Marc / The Seattle Times (Seattle, WA)
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