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Forestaff :: Forestaff (n.) An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff..

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

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..

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

Head :: Head (n.) The source, fountain, spring, or beginning, as of a stream or river; as, the head of the Nile; hence, the altitude of the source, or the height of the surface, as of water, above a given place, as above an orifice at which it issues, and the pressure resulting from the height or from motion; sometimes also, the quantity in reserve; as, a mill or reservoir has a good head of water, or ten feet head; also, that part of a gulf or bay most remote from the outlet or the sea..

Refraction :: Refraction (n.) The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude..

High :: High (adv.) In a high manner; in a high place; to a great altitude; to a great degree; largely; in a superior manner; eminently; powerfully.

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

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..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

Observation :: Observation (n.) Specifically, the act of measuring, with suitable instruments, some magnitude, as the time of an occultation, with a clock; the right ascension of a star, with a transit instrument and clock; the sun's altitude, or the distance of the moon from a star, with a sextant; the temperature, with a thermometer, etc..

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

Altitude :: Altitude (n.) The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, 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.) Height of degree; highest point or degree.

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

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

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

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..

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