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Sidereal time ("sidereal" pronounced / s aɪ ˈ d ɪər i əl, s ə-/ sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system , it is easy to locate the positions of celestial objects in the night sky .
A sidereal year (/ saɪˈdɪəri.əl /, US also / sɪ -/; from Latin sidus 'asterism, star'), also called a sidereal orbital period, is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars. Hence, for Earth, it is also the time taken for the Sun to return to the same position relative to ...
In astrology, sidereal and tropical are terms that refer to two different systems of ecliptic coordinates used to divide the ecliptic into twelve "signs". Each sign is divided into 30 degrees, making a total of 360 degrees. [1] The terms sidereal and tropical may also refer to two different definitions of a year, applied in sidereal solar ...
Look up sidereal in Wiktionary, the free dictionary. 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.
Rotation period (astronomy) In astronomy, the rotation period or spin period[1] of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the sidereal rotation period (or sidereal day), i.e., the time that the object takes to complete a full rotation around its axis relative to the background ...
Sidereal Pisces: Mar 15 - Apr 14 | True Sidereal Pisces: Mar 10 - Apr 20. What kinds of astrologers use sidereal astrology? Most of the astrologers you come into contact with in your day-to-day ...
Lunar month. In lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month. Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as ...
A solar calendar is a calendar whose dates indicate the season or almost equivalently the apparent position of the Sun relative to the stars. The Gregorian calendar, widely accepted as a standard in the world, is an example of a solar calendar. The main other types of calendar are lunar calendar and lunisolar calendar, whose months correspond ...