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	Eng ID	Term	Definition
	61	age of phase inequality	The time interval between new or full moon and the maximum effect of these phases upon the range of tide or the speed of the tidal current.
	62	age of the moon	The elapsed time since the last new moon; usually expressed in DAYS and fractions of a DAY. See PHASES OF THE MOON.
	63	age of tide	See AGE OF PHASE INEQUALITY.
	64	agger	See TIDE: DOUBLE.
	65	aggradation	See ACCRETION.
	66	agonic line	The line through all points on the EARTH's surface at which the MAGNETIC VARIATION is zero.
	67	aground	Touching, resting or lodged on the BOTTOM of shallow water. The opposite is AFLOAT.
	68	ahead	Bearing approximately 000° relative. The term is often used loosely for dead ahead or bearing exactly 000° relative. The opposite is ASTERN.
	69	aid to navigation	A visual, acoustical, or RADIO device, external to a ship, designed to assist in determining a safe COURSE or a vessel’s POSITION, or to war... more A visual, acoustical, or RADIO device, external to a ship, designed to assist in determining a safe COURSE or a vessel’s POSITION, or to warn of dangers and/or OBSTRUCTIONS. Aids to navigation usually include BUOYS, BEACONS, FOG SIGNALS, LIGHTS, RADIO BEACONS, LEADING MARKS, RADIO position fixing systems and GNSS which are chart-related and assist safe NAVIGATION.
	70	aiming line	See COLLIMATION: LINE OF.
	71	air almanac	See under ALMANAC.
	72	air base	In PHOTOGRAMMETRY, the line joining two AIR STATIONS, or the length of this line; also, the distance (at the SCALE of the STEREOSCOPIC MODEL... more In PHOTOGRAMMETRY, the line joining two AIR STATIONS, or the length of this line; also, the distance (at the SCALE of the STEREOSCOPIC MODEL) between adjacent PERSPECTIVE CENTRES as reconstructed in the plotting instrument. See also PHOTO BASE.
	73	air camera	A CAMERA specially designed for use in flying craft.
	74	air mass	Ensemble of air particles whose PATHS and physical properties exhibit, in the horizontal, only small and continuous differences. The mass ma... more Ensemble of air particles whose PATHS and physical properties exhibit, in the horizontal, only small and continuous differences. The mass may extend over an area of several million square miles and over a depth of several kilometres.
	75	air navigation	See NAVIGATION.
	76	air photograph	See PHOTOGRAPH: AERIAL.
	77	air photography	See PHOTOGRAPHY: AERIAL.
	78	air sextant	See SEXTANT.
	79	air speed	The SPEED of an aircraft relative to the surrounding ATMOSPHERE. As opposed to GROUND SPEED.
	80	air station	In PHOTOGRAMMETRY, the point in space occupied by the camera lens at the moment of EXPOSURE. Also called exposure station or camera station... more In PHOTOGRAMMETRY, the point in space occupied by the camera lens at the moment of EXPOSURE. Also called exposure station or camera station.
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