Both solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis: solar time is reckoned according …

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

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Feb 20, 2026 · The sidereal year is the length of time it takes for the Earth to complete a single orbit, on average 365.256363 days. …

This data service calculates Greenwich and local mean and apparent sidereal time.

This disambiguation page lists articles associated with the title Sidereal. If an internal link incorrectly led you here, you may wish to …

Jun 10, 2012 · Sidereal time measures the rotation of our planet relative to the stars. It allows astronomers to keep time without …

Sidereal is an adjective that first popped up in the 17th century, and stems from the Latin word sidereus, which means "star." …

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

Sidereal refers to anything related to stars or constellations. More specifically, it is often used in the context of time measurement, …