sidereal time
1Sidereal time — is a measure of the position of the Earth in its rotation around its axis, or time measured by the apparent diurnal motion of the vernal equinox, which is very close to, but not identical to, the motion of stars. They differ by the precession of… …
2sidereal time — n. 1. time measured by the sidereal day: it is divided into the sidereal hour (1/ 24 of a sidereal day), the sidereal minute (1/ 60 of a sidereal hour), and the sidereal second (1/ 60 of a sidereal minute) 2. the hour angle of the vernal equinox …
3Sidereal time — Time Time, n.; pl. {Times}. [OE. time, AS. t[=i]ma, akin to t[=i]d time, and to Icel. t[=i]mi, Dan. time an hour, Sw. timme. [root]58. See {Tide}, n.] 1. Duration, considered independently of any system of measurement or any employment of terms… …
4sidereal time — Astron. time measured by the diurnal motion of stars. A sidereal day is about four minutes shorter than a solar day, with hours, minutes, and seconds all proportionally shorter. [1805 15] * * * ▪ astronomy time as measured by the apparent… …
5sidereal time — The sidereal time at any place is the hour angle of the vernal equinox at that place …
6sidereal time — noun measured by the diurnal motion of stars • Hypernyms: ↑cosmic time • Hyponyms: ↑sidereal day, ↑day, ↑sidereal year, ↑sidereal hour, ↑sidereal month …
7sidereal time — noun Date: 1764 1. time based on the sidereal day 2. the hour angle of the vernal equinox at a place …
8sidereal time — side′real time′ n. astron. time measured by the diurnal motion of stars • Etymology: 1805–15 …
9sidereal time — noun Time measured by the apparent diurnal motion of the vernal equinox; approximated by that based on the rotation of the Earth relative to the stars …
10sidereal time — noun Astronomy time reckoned from the motion of the earth (or a planet) relative to the distant stars (rather than with respect to the sun) …
