Sidereal time - Wikipedia 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 time: What is it? - EarthSky 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 | English meaning - Cambridge Dictionary Should we really consider two corresponding sections of the same scale as exactly equal to one another: two sidereal days, for example, as exactly equal intervals of time?
Sidereal time | Celestial Coordinates, Celestial Sphere Equinoxes . . . 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 The primary unit of sidereal time is the sidereal day, which is subdivided into 24 sidereal hours,
What does Sidereal mean? - Definitions. net Sidereal refers to anything related to stars or constellations More specifically, it is often used in the context of time measurement, where a sidereal day is the time it takes for the Earth to make one complete rotation in relation to the stars, which is approximately 23 hours, 56 minutes
Sidereal Day vs. Solar Day - Whats the Difference? - This vs. That Sidereal day and solar day are two different ways of measuring time on Earth A sidereal day is the time it takes for the Earth to complete one full rotation on its axis relative to the stars It lasts approximately 23 hours, 56 minutes, and 4 seconds
Sidereal - definition of sidereal by The Free Dictionary Define sidereal sidereal synonyms, sidereal pronunciation, sidereal translation, English dictionary definition of sidereal adj 1 Of, relating to, or concerned with the stars or constellations; stellar 2 Measured or determined by means of the apparent daily motion of the
Sidereal vs. Synodic - Motions of the Sun - NAAP A sidereal year is the time it takes for the sun to return to the same position with respect to the stars Due to the precession of the equinoxes the sidereal year is about 20 minutes longer than the tropical year