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

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

Cross-staff :: Cross-staff (n.) An instrument formerly used at sea for taking the altitudes of celestial bodies.

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

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.

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..

Forestaff :: Forestaff (n.) An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff..

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

Altitude :: Altitude (n.) Elevation of spirits; heroics; haughty airs.

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..

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..

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

Elevation :: Elevation (n.) The distance of a celestial object above the horizon, or the arc of a vertical circle intercepted between it and the horizon; altitude; as, the elevation of the pole, or of a star..

Bow :: Bow (v. t.) A rude sort of quadrant formerly used for taking the sun's altitude at sea.

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

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

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

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..

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

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

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