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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..

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

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

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.

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..

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

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

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

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

Altitude :: Altitude (n.) Space extended upward; height; the perpendicular elevation of an object above its foundation, above the ground, or above a given level, or of one object above another; as, the altitude of a mountain, or of a bird above the top of a tree..

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..

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..

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

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

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

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

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

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..

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..

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..

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