…now well established as its rotation period (sidereal day).
., the length of its sidereal day—causes the Sun to drift slowly westward in Mercury’s sky.
The sidereal day is almost 4 minutes shorter than the mean solar day of 24 of the hours shown by ordinary timepieces.
The rotation period, or length of a sidereal day (see day; sidereal time)—23 hours, 56 minutes, and 4 seconds—is similar to that…
Observations from Earth have revealed that Pluto’s brightness varies with a period of 6.3873 Earth days, which is now well established as its rotation period (sidereal day).
…pendulum’s suspension is a counterclockwise rotation of the Earth once approximately every 24 hours (more precisely, once every 23 hours 56 minutes 4 seconds, the length of a sidereal day).
The sidereal day is the time required for the Earth to rotate once relative to the background of the stars—i.e., the time between two observed passages of a star over the same meridian of longitude.
Sidereal time may be defined for any place on the Earth, but in the international system used by astronomers each sidereal day begins at the instant the vernal equinox transits the prime meridian.
It is equal to a sidereal day (see sidereal time), the rotational period of Earth measured against the fixed stars (about four minutes shorter than the conventional 24-hour solar day).
Because the orbital motion of the Earth makes the Sun seem to move slightly eastward each day relative to the stars, the solar day is about four minutes longer than the sidereal day; i.e., the mean solar day is 24 hours 3 minutes 56.555 seconds of mean sidereal time; more usually the sidereal day is expressed in terms of solar time, being 23 hours 56 minutes 4 seconds of mean solar time long.
So far, it has not been demonstrated how the Maya reckoned the seasons of their agricultural cycle or whether they observed the tropical or the sidereal year.
…of the universe was the mahāyuga, consisting of 4,320,000 sidereal years.
Dim and wonderful is the vision I have conjured up in my mind of life spreading slowly from this little seed bed of the solar system throughout the inanimate vastness of sidereal space.
William Herschel, in full Sir William Frederick Herschel, original name Friedrich Wilhelm Herschel, (born November 15, 1738, Hannover, Hanover—died August 25, 1822, Slough, Buckinghamshire, England), German-born British astronomer, the founder of sidereal astronomy for the systematic observation of the heavens.
The synodic period of a satellite will usually differ from its sidereal period because Earth rotates beneath the satellite.
The time required for a satellite to complete one sidereal, or Keplerian, orbit (defined in reference to the “fixed,” or apparently motionless, stars in distant space) is called its period.
More intricate statements pair a blank tone with a confounding meaning: a girl “is propelled by sidereal energies.”
At the same time, as I can see only now, they were alike in their possession of a purity of spirit that shone—through ordinary or foolish or desperate actions—with a steady sidereal gleam.
There is no astronomical error more unaccountable than that which reconciles the known retardation of the comets with the idea of their passage through an ether: for, however rare this ether be supposed, it would put a stop to all sidereal revolution in a very far briefer period than has been admitted by those astronomers who have endeavored to slur over a point which they found it impossible to comprehend.
They used the intersection between the 50-day and 200-day moving averages as a proxy for trend, with a positive percentage representing how far above the 50-day is from the 200-day and a negative percentage indicating how far the 50-day is below the 200-day.
- the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
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