Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.
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.
..... Click the link for more information. ). 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.
..... Click the link for more information. 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
..... Click the link for more information. ; for this reason, the sidereal year does not stay in step with the seasons.
sidereal yearThe 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.
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.