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Although ERA is intended to replace sidereal time, there is a need to maintain definitions for sidereal time during the transition, and when working with older data and documents. Similarly to mean solar time, every location on Earth has its own local sidereal time (LST), depending on the longitude of the point.
Sidereal, meaning "of the stars", may refer to: Sidereal time; Sidereal day; Sidereal month; Sidereal year; Sidereal period of an object orbiting another astronomical object; Sidereal and tropical astrology
Anti-sidereal time has about 364.25 days per year, one day less than the number of days in a year of solar time, 365.25. Thus each anti-sidereal day is longer than a solar day (24 hr) by about four minutes or 24 hr 4 min. Extended-sidereal time has about 367.25 days per year, one day more than the number of days in a year of sidereal time, 366. ...
About Wikipedia; Contact us; Donate; Contribute Help; ... 7 Sidereal time and solar time. ... 10 Formula for determining Solar Day from Sidereal Day.
Universal time tracks the Earth's rotation in time, which performs one revolution in about 24 hours. The Earth's rotation is uneven, so UT is not linear with respect to atomic time. It is practically proportional to the sidereal time, which is also a direct measure of Earth rotation. The excess revolution time is called length of day (LOD).
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There seems to be a typo in the equation given in the section called "Relationship between solar time and sidereal time intervals" (or, at least, it's different from what is in the reference). Equation 3.17 on page 81 of Urban & Seidelmann (i.e., the reference given) says r' = 1.002 737 379 093 507 95 + 5.9006e(-11)*t - 5.9e(-15)*t**2.
A Gaussian year is defined as 365.2568983 days. [1] It was adopted by Carl Friedrich Gauss as the length of the sidereal year in his studies of the dynamics of the solar system. A slightly different value is now accepted as the length of the sidereal year, [ 2 ] and the value accepted by Gauss is given a special name.