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2 definitions found
 for Sidereal clock
From The Collaborative International Dictionary of English v.0.48 :

  Sidereal \Si*de"re*al\, a. [L. sidereus, from sidus, sideris, a
     constellation, a star. Cf. Sideral, Consider, Desire.]
     1. Relating to the stars; starry; astral; as, sidereal
        astronomy.
        [1913 Webster]
  
     2. (Astron.) Measuring by the apparent motion of the stars;
        designated, marked out, or accompanied, by a return to the
        same position in respect to the stars; as, the sidereal
        revolution of a planet; a sidereal day.
        [1913 Webster]
  
     Sidereal clock, day, month, year. See under Clock,
        Day, etc.
  
     Sideral time, time as reckoned by sideral days, or, taking
        the sidereal day as the unit, the time elapsed since a
        transit of the vernal equinox, reckoned in parts of a
        sidereal day. This is, strictly, apparent sidereal time,
        mean sidereal time being reckoned from the transit, not of
        the true, but of the mean, equinoctial point.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Clock \Clock\ (kl[o^]k), n. [AS. clucge bell; akin to D. klok
     clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka
     bell, LL. clocca, cloca (whence F. cloche); al perh. of
     Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch
     bell. Cf. Cloak.]
     1. A machine for measuring time, indicating the hour and
        other divisions; in ordinary mechanical clocks for
        domestic or office use the time is indicated on a
        typically circular face or dial plate containing two
        hands, pointing to numbers engraved on the periphery of
        the face, thus showing the hours and minutes. The works of
        a mechanical clock are moved by a weight or a spring, and
        it is often so constructed as to tell the hour by the
        stroke of a hammer on a bell. In electrical or electronic
        clocks, the time may be indicated, as on a mechanical
        clock, by hands, but may also be indicated by direct
        digital readout, with the hours and minutes in normal
        Arabic numerals. The readout using hands is often called
        analog to distinguish it from the digital readout. Some
        clocks also indicate the seconds. Clocks are not adapted,
        like the watch, to be carried on the person. Specialized
        clocks, such as atomic clocks, may be constructed on
        different principles, and may have a very high precision
        for use in scientific observations.
        [1913 Webster +PJC]
  
     2. A watch, esp. one that strikes. [Obs.] --Walton.
        [1913 Webster]
  
     3. The striking of a clock. [Obs.] --Dryden.
        [1913 Webster]
  
     4. A figure or figured work on the ankle or side of a
        stocking. --Swift.
        [1913 Webster]
  
     Note: The phrases what o'clock? it is nine o'clock, etc., are
           contracted from what of the clock? it is nine of the
           clock, etc.
           [1913 Webster]
  
     Alarm clock. See under Alarm.
  
     Astronomical clock.
        (a) A clock of superior construction, with a compensating
            pendulum, etc., to measure time with great accuracy,
            for use in astronomical observatories; -- called a
            regulator when used by watchmakers as a standard for
            regulating timepieces.
        (b) A clock with mechanism for indicating certain
            astronomical phenomena, as the phases of the moon,
            position of the sun in the ecliptic, equation of time,
            etc.
  
     Electric clock.
        (a) A clock moved or regulated by electricity or
            electro-magnetism.
        (b) A clock connected with an electro-magnetic recording
            apparatus.
  
     Ship's clock (Naut.), a clock arranged to strike from one
        to eight strokes, at half hourly intervals, marking the
        divisions of the ship's watches.
  
     Sidereal clock, an astronomical clock regulated to keep
        sidereal time.
        [1913 Webster]

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