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sidereal day
(redirected from sidereal days)

    Also found in: Encyclopedia 0.04 sec.
sidereal day
n.
The time required for a complete rotation of the earth in reference to any star or to the vernal equinox at the meridian, equal to 23 hours, 56 minutes, 4.09 seconds in units of mean solar time.
sidereal day
n
(Astronomy) See day [5]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.sidereal day - the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
day
time unit, unit of time - a unit for measuring time periods
sidereal time - measured by the diurnal motion of stars


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