- sidereal second
- noun Date: circa 1909 the 60th part of a sidereal minute
New Collegiate Dictionary. 2001.
sidereal second
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sidereal second — noun : the sixtieth part of a sidereal minute compare second 2 … Useful english dictionary
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 day — a unit of time used in astronomy, equal to the period of time in which the earth makes one rotation relative to the stars. If we could view the earth from outside the Solar System, we would see that it actually completes 366.242 rotations… … Dictionary of units of measurement
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 year — The sidereal year is the time taken for the Sun to return to the same position with respect to the stars of the celestial sphere. It is the orbital period of Earth, equal to 365.25636042 mean solar days (31,558,149.540 seconds), that is… … Wikipedia
Second — This article is about the unit of time. For other uses, see Second (disambiguation). A light flashing approximately once per second. The second (SI unit symbol: s; informal abbreviation: sec) is a unit of measurement of time, and is the… … Wikipedia
second — 1. (s or sec or ) a fundamental unit of time in all measuring systems and the SI base unit of time. The name simply means that this unit is the second division of the hour, the minute being the first (see minute [0]). The second was defined … Dictionary of units of measurement
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
second — Synonyms and related words: B, Janus like, Maecenas, OK, abettor, abundant year, academic year, accept, accredit, acolyte, adjutant, admirer, advance, advocate, affirm, aficionado, agent, aid, aide, aide de camp, aider, alternate, alternative,… … Moby Thesaurus
Hindu chronology — The subject of Hindu chronology divides naturally into three parts: the calendar, the eras, and other reckonings. The Calendar The Hindus have had, from very ancient times, the system of lunisolar cycles, made by the combination of solar years,… … Wikipedia
