Both solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis: solar time is reckoned according to the position of the Sun in the sky while sidereal time is …

The meaning of SIDEREAL is of, relating to, or expressed in relation to stars or constellations : astral.

Sidereal definition: determined by or from the stars.. See examples of SIDEREAL used in a sentence.

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 …

Aug 15, 2025 · Sidereal time, unlike solar time (everyday clock time), is referenced to the stars and is defined as the right ascension of the celestial object on the local meridian. Sidereal time …

By convention, rotation periods of planets are given in sidereal terms unless otherwise specified.

Jun 10, 2012 · 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, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

A sidereal day depends only upon rotation. So picture Earth isolated in space and spinning at is present rate -- it would take 23 hours and 56 minutes for one complete rotation.

Look up sidereal in Wiktionary, the free dictionary. Sidereal, meaning "of the stars", may refer to: