Sidereal hour
Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The twenty-fourth part of a day; sixty minutes. [1913 Webster]

2. The time of the day, as expressed in hours and minutes, and indicated by a timepiece; as, what is the hour? At what hour shall we meet? [1913 Webster]

3. Fixed or appointed time; conjuncture; a particular time or occasion; as, the hour of greatest peril; the man for the hour. [1913 Webster]

Woman, . . . mine hour is not yet come. --John ii. 4. [1913 Webster]

This is your hour, and the power of darkness. --Luke xxii. 53. [1913 Webster]

4. pl. (R. C. Ch.) Certain prayers to be repeated at stated times of the day, as matins and vespers. [1913 Webster]

5. A measure of distance traveled. [1913 Webster]

Vilvoorden, three hours from Brussels. --J. P. Peters. [1913 Webster]

{After hours}, after the time appointed for one's regular labor.

{Canonical hours}. See under {Canonical}.

{Hour angle} (Astron.), the angle between the hour circle passing through a given body, and the meridian of a place.

{Hour circle}. (Astron.) (a) Any circle of the sphere passing through the two poles of the equator; esp., one of the circles drawn on an artificial globe through the poles, and dividing the equator into spaces of 15[deg], or one hour, each. (b) A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated in hours and subdivisions of hours of right ascension. (c) A small brass circle attached to the north pole of an artificial globe, and divided into twenty-four parts or hours. It is used to mark differences of time in working problems on the globe.

{Hour hand}, the hand or index which shows the hour on a timepiece.

{Hour line}. (a) (Astron.) A line indicating the hour. (b) (Dialing) A line on which the shadow falls at a given hour; the intersection of an hour circle which the face of the dial.

{Hour plate}, the plate of a timepiece on which the hours are marked; the dial. --Locke.

{Sidereal hour}, the twenty-fourth part of a sidereal day.

{Solar hour}, the twenty-fourth part of a solar day.

{The small hours}, the early hours of the morning, as one o'clock, two o'clock, etc.

{To keep good hours}, to be regular in going to bed early. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • sidereal hour — noun 1/24 of a sidereal day • Hypernyms: ↑hour, ↑hr, ↑60 minutes, ↑sidereal time * * * noun : the twenty fourth part of a sidereal day …   Useful english dictionary

  • sidereal hour — noun Date: circa 1695 the 24th part of a sidereal day …   New Collegiate Dictionary

  • sidereal hour — /saɪˌdɪəriəl ˈaʊə/ (say suy.dearreeuhl owuh) noun one 24th part of a sidereal day …   Australian English dictionary

  • sidereal hour angle — Astron. the angle, measured westward through 360°, between the hour circle passing through the vernal equinox and the hour circle of a celestial body. Cf. hour angle. * * * …   Universalium

  • sidereal hour angle — noun : a coordinate in the equator system of coordinates used by navigators in place of right ascension, measured westward from the March equinox, and expressed in degrees up to 360° * * * Astron. the angle, measured westward through 360°,… …   Useful english dictionary

  • sidereal hour angle — The angle about the celestial pole between the celestial meridian of the first point of Aries and the celestial meridian of the body, measured westward from the celestial meridian of the first point of Aries …   Aviation 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

  • Hour — Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The… …   The Collaborative International Dictionary of English

  • Hour angle — Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The …   The Collaborative International Dictionary of English

  • Hour circle — Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The …   The Collaborative International Dictionary of English

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