sidereal day

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Related to sidereal days: sidereal time

sidereal day

n.
The time required for a single rotation of the earth on its axis 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 day5

side′real day′



n.
the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.
[1785–95]

sidereal day

A measure of time approximately equal to 23 hr, 56 min, 4.09 sec. A sidereal day represents the time needed for one complete rotation of the Earth on its axis.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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
time unit, unit of time - a unit for measuring time periods
sidereal time - measured by the diurnal motion of stars
References in periodicals archive ?
Splitting of the local-time peak in Fig 1c is similar to splitting of the daily period in two peaks with periods equal to solar and sidereal days [9-11].
The Earth's orbit around the sun means that the Earth rotates one extra time relative to the stars, so there are 366 stellar or sidereal days to 365 solar days.