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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.

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

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

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..

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..

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

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

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

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..

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

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

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

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

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..

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

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..

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..

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..

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..

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

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