sidereal year


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Related to sidereal year: tropical year, anomalistic year

sidereal year,

time required for the earth to complete an orbit of the sun relative to the stars. The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar timesolar time,
time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial.
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). It is 20 min longer than the tropical yeartropical year,
time between successive vernal equinoxes; 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time). The tropical year is the basis of the year used in the Gregorian calendar.
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 because of the precession of the equinoxesprecession of the equinoxes,
westward motion of the equinoxes along the ecliptic. This motion was first noted by Hipparchus c.120 B.C. The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to
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; for this reason, the sidereal year does not stay in step with the seasons.

sidereal year

The time taken by the Earth to complete one revolution around the Sun with reference to a background star or stellar group, which is regarded as fixed in position. It is thus the interval between two successive passages of the Sun, in its apparent annual motion around the celestial sphere, through a particular point relative to the stars. It is equal to 365.256 36 days and is about 20 minutes longer than the tropical year.

Sidereal Year

(religion, spiritualism, and occult)

A sidereal year is the time it takes Earth to complete an orbit of the Sun relative to the fixed stars. The length of a sidereal year is 365 days 6 hours 9 minutes and 9.54 seconds, which is slightly longer than a solar year.

Sidereal Year

 

the period of time between two successive arrivals of the sun, in its apparent annual motion, at the same point (with respect to the stars) on the celestial sphere. The sidereal year is equal to the earth’s period of revolution around the sun, with respect to the stars. The duration of a sidereal year is 365.25636 mean solar days.

sidereal year

[sī′dir·ē·əl ′yir]
(astronomy)
The time period relative to the stars of one revolution of the earth around the sun; it is about 365.2564 mean solar days.

sidereal year

sidereal yearclick for a larger image
Measurement of the sidereal year.
sidereal year
Left wing down. Nose remains on heading. Flight path to the left of the heading.
sidereal year
The ball of the slip indicator is inside the turn indicating that it is an unbalanced turn.
sidereal year
The period of one complete revolution of the earth around the sun with respect to a fixed point, 365 days 6 h 9 min and 9.5534 s in the year 1900, and increasing at a rate of 0.0001 s annually. Because of the precession of the equinoxes, this is about 20 min longer than a tropical year.