- sidereal time
- noun Date: 1764 1. time based on the sidereal day 2. the hour angle of the vernal equinox at a place
New Collegiate Dictionary. 2001.
sidereal time
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Sidereal 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… … Wikipedia
sidereal 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 … English World dictionary
Sidereal 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… … The Collaborative International Dictionary of English
sidereal 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… … Universalium
sidereal time — The sidereal time at any place is the hour angle of the vernal equinox at that place … Aviation dictionary
sidereal time — noun measured by the diurnal motion of stars • Hypernyms: ↑cosmic time • Hyponyms: ↑sidereal day, ↑day, ↑sidereal year, ↑sidereal hour, ↑sidereal month … Useful english dictionary
sidereal time — side′real time′ n. astron. time measured by the diurnal motion of stars • Etymology: 1805–15 … From formal English to slang
sidereal 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 … Wiktionary
sidereal 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) … English new terms dictionary
Greenwich sidereal time — The sidereal time elapsed since the transit of the Greenwich Meridian by the first point of the Aries … Aviation dictionary
