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	Eng ID	Term	Definition
	101	altimetry	The process of determining the difference of ELEVATION by the use of ALTIMETERS.
	102	altitude	The vertical distance of a LEVEL, a POINT or an object considered as a POINT (but not affixed to the surface of the EARTH), measured from a ... more The vertical distance of a LEVEL, a POINT or an object considered as a POINT (but not affixed to the surface of the EARTH), measured from a given DATUM, usually MEAN SEA LEVEL. See also ELEVATION and HEIGHT.- 2. In ASTRONOMY, the vertical angle between the plane of the HORIZON and the line to a CELESTIAL BODY. See also ANGLE OF DEPRESSION and ANGLE OF ELEVATION.
	103	altitude: apparent	The SEXTANT ALTITUDE of a CELESTIAL BODY corrected for INDEX ERROR, DIP (HEIGHT of EYE), and (for SUN or MOON only) SEMIDIAMETER. Also calle... more The SEXTANT ALTITUDE of a CELESTIAL BODY corrected for INDEX ERROR, DIP (HEIGHT of EYE), and (for SUN or MOON only) SEMIDIAMETER. Also called rectified altitude.
	104	altitude: ex-meridian	An ALTITUDE of a CELESTIAL BODY near the CELESTIAL MERIDIAN of the observer, to which a CORRECTION is to be applied to determine the MERIDIA... more An ALTITUDE of a CELESTIAL BODY near the CELESTIAL MERIDIAN of the observer, to which a CORRECTION is to be applied to determine the MERIDIAN ALTITUDE. Also called circummeridian altitude.
	105	altitude: flight	The vertical distance above a given DATUM, usually MEAN SEA LEVEL, or an aircraft in flight.
	106	altitude: meridian	The ALTITUDE of a CELESTIAL BODY when it is on the CELESTIAL MERIDIAN of the observer.
	107	altitude: observed	The SEXTANT ALTITUDE of a CELESTIAL BODY after all corrections (see ALTITUDE: APPARENT) have been applied. In American terminology the term ... more The SEXTANT ALTITUDE of a CELESTIAL BODY after all corrections (see ALTITUDE: APPARENT) have been applied. In American terminology the term is usually employed in the place of TRUE ALTITUDE.
	108	altitude: rectified	See ALTITUDE: APPARENT.
	109	altitude: sextant	The ALTITUDE as indicated by a SEXTANT before CORRECTIONS are applied.
	110	altitude: true	The APPARENT ALTITUDE of a CELESTIAL BODY after all corrections have been applied. In American terminology usually referred to as OBSERVED A... more The APPARENT ALTITUDE of a CELESTIAL BODY after all corrections have been applied. In American terminology usually referred to as OBSERVED ALTITUDE.
	111	altitude difference	See INTERCEPT.
	112	altocumulus	See CLOUD GENERA.
	113	altostratus	See CLOUD GENERA.
	114	aluminium sheet	An aluminium-mounted paper sheet occasionally used for BOAT-SHEETS, SMOOTH SHEETS, or plane table boards.
	115	ambient noise	The erratic electromagnetic or sonic background noise emitted by natural or artificial sources contaminating the proper signal.
	116	ambiguity	Uncertainty of value or meaning because of the possibility of two or more interpretations. The condition when navigational COORDINATES defin... more Uncertainty of value or meaning because of the possibility of two or more interpretations. The condition when navigational COORDINATES define more than one POSITION, DIRECTION, LINE OF POSITION, or SURFACE OF POSITION.
	117	Amici prism	A prism which deviates the RAYS of light through 90° and because of its shape inverts the IMAGE. See ROOF PRISM.
	118	amidships	At, near, or toward the middle of a ship.
	119	ampere	The unit of density of electric current in the SI SYSTEM.
	120	amphidromic point	A no-tide point, from which COTIDAL LINES radiate.
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