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4 definitions found
 for Vertical circle
From The Collaborative International Dictionary of English v.0.48 :

  Vertical \Ver"ti*cal\, a. [Cf. F. vertical. See Vertex.]
     [1913 Webster]
     1. Of or pertaining to the vertex; situated at the vertex, or
        highest point; directly overhead, or in the zenith;
        perpendicularly above one.
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              Charity . . . is the vertical top of all religion.
                                                    --Jer. Taylor.
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     2. Perpendicular to the plane of the horizon; upright; plumb;
        as, a vertical line.
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     Vertical angle (Astron. & Geod.), an angle measured on a
        vertical circle, called an angle of elevation, or
        altitude, when reckoned from the horizon upward, and of
        depression when downward below the horizon.
     Vertical anthers (Bot.), such anthers as stand erect at the
        top of the filaments.
     Vertical circle (Astron.), an azimuth circle. See under
     Vertical drill, an upright drill. See under Upright.
     Vertical fire (Mil.), the fire, as of mortars, at high
        angles of elevation.
     Vertical leaves (Bot.), leaves which present their edges to
        the earth and the sky, and their faces to the horizon, as
        in the Australian species of Eucalyptus.
     Vertical limb, a graduated arc attached to an instrument,
        as a theodolite, for measuring vertical angles.
     Vertical line.
        (a) (Dialing) A line perpendicular to the horizon.
        (b) (Conic Sections) A right line drawn on the vertical
            plane, and passing through the vertex of the cone.
        (c) (Surv.) The direction of a plumb line; a line normal
            to the surface of still water.
        (d) (Geom., Drawing, etc.) A line parallel to the sides of
            a page or sheet, in distinction from a horizontal line
            parallel to the top or bottom.
     Vertical plane.
        (a) (Conic Sections) A plane passing through the vertex of
            a cone, and through its axis.
        (b) (Projections) Any plane which passes through a
            vertical line.
        (c) (Persp.) The plane passing through the point of sight,
            and perpendicular to the ground plane, and also to the
     Vertical sash, a sash sliding up and down. Cf. French
        sash, under 3d Sash.
     Vertical steam engine, a steam engine having the crank
        shaft vertically above or below a vertical cylinder.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Azimuth \Az"i*muth\, n. [OE. azimut, F. azimut, fr. Ar.
     as-sum?t, pl. of as-samt a way, or perh., a point of the
     horizon and a circle extending to it from the zenith, as
     being the Arabic article: cf. It. azzimutto, Pg. azimuth, and
     Ar. samt-al-r[=a]'s the vertex of the heaven. Cf. Zenith.]
     (Astron. & Geodesy)
        (a) The quadrant of an azimuth circle.
        (b) An arc of the horizon intercepted between the meridian
            of the place and a vertical circle passing through the
            center of any object; as, the azimuth of a star; the
            azimuth or bearing of a line surveying.
            [1913 Webster]
     Note: In trigonometrical surveying, it is customary to reckon
           the azimuth of a line from the south point of the
           horizon around by the west from 0[deg] to 360[deg].
           [1913 Webster]
     Azimuth circle, or Vertical circle, one of the great
        circles of the sphere intersecting each other in the
        zenith and nadir, and cutting the horizon at right angles.
     Azimuth compass, a compass resembling the mariner's
        compass, but having the card divided into degrees instead
        of rhumbs, and having vertical sights; used for taking the
        magnetic azimuth of a heavenly body, in order to find, by
        comparison with the true azimuth, the variation of the
     Azimuth dial, a dial whose stile or gnomon is at right
        angles to the plane of the horizon. --Hutton.
     Magnetic azimuth, an arc of the horizon, intercepted
        between the vertical circle passing through any object and
        the magnetic meridian. This is found by observing the
        object with an azimuth compass.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Circle \Cir"cle\ (s[~e]r"k'l), n. [OE. cercle, F. cercle, fr. L.
     circulus (Whence also AS. circul), dim. of circus circle,
     akin to Gr. kri`kos, ki`rkos, circle, ring. Cf. Circus,
     [1913 Webster]
     1. A plane figure, bounded by a single curve line called its
        circumference, every part of which is equally distant from
        a point within it, called the center.
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     2. The line that bounds such a figure; a circumference; a
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     3. (Astron.) An instrument of observation, the graduated limb
        of which consists of an entire circle.
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     Note: When it is fixed to a wall in an observatory, it is
           called a mural circle; when mounted with a telescope
           on an axis and in Y's, in the plane of the meridian, a
           meridian circle or transit circle; when involving
           the principle of reflection, like the sextant, a
           reflecting circle; and when that of repeating an
           angle several times continuously along the graduated
           limb, a repeating circle.
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     4. A round body; a sphere; an orb.
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              It is he that sitteth upon the circle of the earth.
                                                    --Is. xi. 22.
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     5. Compass; circuit; inclosure.
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              In the circle of this forest.         --Shak.
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     6. A company assembled, or conceived to assemble, about a
        central point of interest, or bound by a common tie; a
        class or division of society; a coterie; a set.
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              As his name gradually became known, the circle of
              his acquaintance widened.             --Macaulay.
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     7. A circular group of persons; a ring.
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     8. A series ending where it begins, and repeating itself.
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              Thus in a circle runs the peasant's pain. --Dryden.
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     9. (Logic) A form of argument in which two or more unproved
        statements are used to prove each other; inconclusive
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              That heavy bodies descend by gravity; and, again,
              that gravity is a quality whereby a heavy body
              descends, is an impertinent circle and teaches
              nothing.                              --Glanvill.
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     10. Indirect form of words; circumlocution. [R.]
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               Has he given the lie,
               In circle, or oblique, or semicircle. --J.
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     11. A territorial division or district.
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     The Circles of the Holy Roman Empire, ten in number, were
        those principalities or provinces which had seats in the
        German Diet.
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     Azimuth circle. See under Azimuth.
     Circle of altitude (Astron.), a circle parallel to the
        horizon, having its pole in the zenith; an almucantar.
     Circle of curvature. See Osculating circle of a curve
     Circle of declination. See under Declination.
     Circle of latitude.
         (a) (Astron.) A great circle perpendicular to the plane
             of the ecliptic, passing through its poles.
         (b) (Spherical Projection) A small circle of the sphere
             whose plane is perpendicular to the axis.
     Circles of longitude, lesser circles parallel to the
        ecliptic, diminishing as they recede from it.
     Circle of perpetual apparition, at any given place, the
        boundary of that space around the elevated pole, within
        which the stars never set. Its distance from the pole is
        equal to the latitude of the place.
     Circle of perpetual occultation, at any given place, the
        boundary of the space around the depressed pole, within
        which the stars never rise.
     Circle of the sphere, a circle upon the surface of the
        sphere, called a great circle when its plane passes
        through the center of the sphere; in all other cases, a
        small circle.
     Diurnal circle. See under Diurnal.
     Dress circle, a gallery in a theater, generally the one
        containing the prominent and more expensive seats.
     Druidical circles (Eng. Antiq.), a popular name for certain
        ancient inclosures formed by rude stones circularly
        arranged, as at Stonehenge, near Salisbury.
     Family circle, a gallery in a theater, usually one
        containing inexpensive seats.
     Horary circles (Dialing), the lines on dials which show the
     Osculating circle of a curve (Geom.), the circle which
        touches the curve at some point in the curve, and close to
        the point more nearly coincides with the curve than any
        other circle. This circle is used as a measure of the
        curvature of the curve at the point, and hence is called
        circle of curvature.
     Pitch circle. See under Pitch.
     Vertical circle, an azimuth circle.
     Voltaic circuit or Voltaic circle. See under Circuit.
     To square the circle. See under Square.
     Syn: Ring; circlet; compass; circuit; inclosure.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

  vertical circle
      n 1: a great circle on the celestial sphere passing through the
           zenith and perpendicular to the horizon

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