sidereal day


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Related to sidereal day: synodic month

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 ?
It is well known that the GPS satellite orbits were selected to have a period of half a sidereal day (23 hours 56 minutes 4 seconds) with a daily repeating ground track [23,24].
The GPS satellite constellation at a specific location repeats at intervals of approximately one sidereal day. MSF is based on the period of the satellite constellation being about 8 s shorter than one sidereal day (Choi et al., 2004).
A geosynchronous orbit can, however, be elongated and inclined with respect to the Earth's equator and still have a period equal to a sidereal day, making the satellite appear to wander around a fixed point on the sky.
Heatrow beat Ample Note by three-length while Regalle was third and Sidereal Day fourth.
Two complete orbits total 23 h 56 min, a period known to astronomers as a sidereal day, the exact time the Earth takes to complete one rotation on its axis.
The synodic day is distinguished from the sidereal day, which is one complete rotation in relation to distant stars.
[[sigma]'.sub.C] = 6.32000 + 0.00237i, [[sigma]'.sub.f] =-0.0146011 +0.0001533, (in radians per sidereal day) are the complex Chandler and FCN frequencies in celestial frame, respectively, [[sigma].sub.C] = 0.01962 + 0.00237, is the complex Chandler frequency in terrestrial frame and [a.sub.p] = 9.509 x [10.sup.-2], [a.sub.w] = 5.489 x [10.sup.-4] are dimensionless constants.
Jockey Gerald Avranche steered the favourite, owned by Al Nasseriyeh and trained by Alan Smith, past Danish Express while Thaqib was third and Sidereal Day fourth.
When she isn't teaching physics, Pamela Gay blogs about our changing understanding of the cosmos one sidereal day at a time at www.starstryder.com.
an increase in d/dt([theta](t)) at sunrise, a decrease at sunset and a maximum deflection at noon) [1,2], having a period length of 1440.24 [+ or -] 2.60 min [2], indicating that it is related to solar and not sidereal time (length of sidereal day: 1436 min, solar day: 1440 min).