English definition of Altitude

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Definition of altitude

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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..

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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.

Label :: Label (n.) A brass rule with sights, formerly used, in connection with a circumferentor, to take altitudes..

Ring :: Ring (n.) An instrument, formerly used for taking the sun's altitude, consisting of a brass ring suspended by a swivel, with a hole at one side through which a solar ray entering indicated the altitude on the graduated inner surface opposite..

Degrade :: Degrade (v. t.) To reduce in altitude or magnitude, as hills and mountains; to wear down..

Chorology :: Chorology (n.) The science which treats of the laws of distribution of living organisms over the earth's surface as to latitude, altitude, locality, etc..

Thermobarometer :: Thermobarometer (n.) An instrument for determining altitudes by the boiling point of water.

Celsiture :: Celsiture (n.) Height; altitude.

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

Argument :: Argument (n.) The quantity on which another quantity in a table depends; as, the altitude is the argument of the refraction..

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

Level :: Level (n.) A uniform or average height; a normal plane or altitude; a condition conformable to natural law or which will secure a level surface; as, moving fluids seek a level..

Nocturnal :: Nocturnal (n.) An instrument formerly used for taking the altitude of the stars, etc., at sea..

Culminate :: Culminate (v. i.) To reach its highest point of altitude; to come to the meridian; to be vertical or directly overhead.

Altimetry :: Altimetry (n.) The art of measuring altitudes, or heights..

Forestaff :: Forestaff (n.) An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff..

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..

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..

Gnomon :: Gnomon (n.) A style or column erected perpendicularly to the horizon, formerly used in astronomocal observations. Its principal use was to find the altitude of the sun by measuring the length of its shadow..

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