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Dioptra :: Dioptra (n.) An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc..

Quadrat :: Quadrat (n.) An old instrument used for taking altitudes; -- called also geometrical square, and line of shadows..

Altitude :: Altitude (n.) Height of degree; highest point or degree.

Height :: Height (n.) The distance to which anything rises above its foot, above that on which in stands, above the earth, or above the level of the sea; altitude; the measure upward from a surface, as the floor or the ground, of animal, especially of a man; stature..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

Gunter''s Quadrant :: Gunter's quadrant () A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale..

Low :: Low (adv.) In a path near the equator, so that the declination is small, or near the horizon, so that the altitude is small; -- said of the heavenly bodies with reference to the diurnal revolution; as, the moon runs low, that is, is comparatively near the horizon when on or near the meridian..

Altazimuth :: Altazimuth (n.) An instrument for taking azimuths and altitudes simultaneously.

Culminant :: Culminant (a.) Being vertical, or at the highest point of altitude; hence, predominant..

Forestaff :: Forestaff (n.) An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff..

High :: High (superl.) Elevated above any starting point of measurement, as a line, or surface; having altitude; lifted up; raised or extended in the direction of the zenith; lofty; tall; as, a high mountain, tower, tree; the sun is high..

Altitude :: Altitude (n.) The elevation of a point, or star, or other celestial object, above the horizon, measured by the arc of a vertical circle intercepted between such point and the horizon. It is either true or apparent; true when measured from the rational or real horizon, apparent when from the sensible or apparent horizon..

Level :: Level (n.) A measurement of the difference of altitude of two points, by means of a level; as, to take a level..

Baculometry :: Baculometry (n.) Measurement of distance or altitude by a staff or staffs.

Altitude :: Altitude (n.) Height of rank or excellence; superiority.

Level :: Level (n.) An approximately horizontal line or surface at a certain degree of altitude, or distance from the center of the earth; as, to climb from the level of the coast to the level of the plateau and then descend to the level of the valley or of the sea..

Quadrant :: Quadrant (n.) An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90¡, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction..

Almucantar :: Almucantar (n.) A small circle of the sphere parallel to the horizon; a circle or parallel of altitude. Two stars which have the same almucantar have the same altitude. See Almacantar.

Culmination :: Culmination (n.) The attainment of the highest point of altitude reached by a heavently body; passage across the meridian; transit.

Altimeter :: Altimeter (n.) An instrument for taking altitudes, as a quadrant, sextant, etc..

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