Sidereal time - Wikipedia
网页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.
Sidereal Definition & Meaning - Merriam-Webster
网页The meaning of SIDEREAL is of, relating to, or expressed in relation to stars or constellations : astral.
Sidereal time: What is it? - EarthSky
网页2012年6月10日 · Sidereal time measures the rotation of our planet relative to the stars. It allows astronomers to keep time without worrying about the motion of Earth around the sun.
Sidereal and tropical astrology - Wikipedia
网页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]
Sidereal year - Wikipedia
网页A sidereal year (/ s aɪ ˈ d ɪər i. əl /, US also / s ɪ-/; 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.
Sidereal time | Celestial Coordinates, Celestial Sphere & Equinoxes
网页sidereal time, time as measured by the apparent motion about the Earth of the distant, so-called fixed, stars, as distinguished from solar time, which corresponds to the apparent motion of the Sun.
Sidereal Astrology: A Deep Dive into Celestial Timekeeping
网页Sidereal astrology is a fascinating approach to understanding the stars and the role they play in our lives. Unlike tropical astrology, which is based on the seasons and the position of the Sun, sidereal astrology focuses on the actual positions of …
Sidereal period | Definition & Facts | Britannica
网页sidereal period, the time required for a celestial body within the solar system to complete one revolution with respect to the fixed stars —i.e., as observed from some fixed point outside the system.
Sidereal Time - Encyclopedia.com
网页2018年6月11日 · Sidereal time is local time reckoned according to the rotation of the Earth with respect to the stars. The sidereal day is 23 hours, 56 minutes and 4 seconds of mean solar time, nearly 4 minutes shorter than the mean solar day. The sidereal year is equal to 365.25636 mean solar days.
Sidereal Time | Time and Navigation - Smithsonian Institution
网页Sidereal time, or “star time,” is based on Earth’s rotation relative to the stars, rather than to the Sun. The sidereal day is almost 4 minutes shorter than our 24-hour day.