SIDEREAL YEAR Meaning and
Definition
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A sidereal year is a unit of time used in astronomy to measure the orbital period of Earth around the Sun. It is defined as the time it takes for the Earth to complete one full orbit around the Sun relative to the fixed stars. Unlike the tropical year, which is based on the position of the Sun relative to the Earth's seasons, the sidereal year is based on the Earth's position relative to distant objects in space, particularly the fixed stars.
The duration of a sidereal year is approximately 365.25636 days or 31,558,149 seconds. It is slightly longer than a tropical year due to the precession of the Earth's rotational axis. The Earth's axial precession causes the dates of equinoxes and solstices to gradually shift relative to the fixed stars over time. As a result, it takes a little longer for the Earth to complete a full revolution around the Sun with respect to the same distant stars.
The concept of the sidereal year is fundamental in astronomical calculations and calendar systems. It is widely used in fields such as astrophysics, planetary science, and celestial mechanics. The determination of the sidereal year allows for accurate celestial observations and predictions of celestial events. By knowing the precise duration of a sidereal year, astronomers can correlate the positions of celestial objects, calculate their motions, and accurately predict their future positions in the night sky.
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The space of time which the sun takes to move from any fixed star till it returns to it again, in its apparent motion, being the real time in which the earth performs one complete revolution, computed at 365 days, 6 hours, 10 min. nearly.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Common Misspellings for SIDEREAL YEAR
- aidereal year
- zidereal year
- xidereal year
- didereal year
- eidereal year
- widereal year
- sudereal year
- sjdereal year
- skdereal year
- sodereal year
- s9dereal year
- s8dereal year
- sisereal year
- sixereal year
- sicereal year
- sifereal year
- sirereal year
- sieereal year
- sidwreal year
Etymology of SIDEREAL YEAR
The word "sidereal" comes from the Latin word "sidereus", which means "of the stars" or "relating to the stars". The term "year" comes from the Old English word "gear", which also means "year". Therefore, the term "sidereal year" refers to the time it takes for the Earth to complete one orbit around the Sun, as measured relative to the positions of the stars.
Similar spelling words for SIDEREAL YEAR
