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	Eng ID	Term	Definition
	2921	logarithmic scale	See SCALE.
	2922	log book	Book in which events connected with the ship are entered. Also written as one word.
	2923	log boom	Heavy logs chained or lashed together and moored or anchored so as to enclose and contain rafted logs. See also BOOM.
	2924	log chip	The wooden quadrant forming part of a CHIP LOG. Also called log ship.
	2925	log factor	The ratio represented by the true distance divided by the LOG distance.
	2926	log factor scale	See SCALE.
	2927	logging	1. Gauging ship's speed with a log. 2. Record events.
	2928	log line	A graduated line used to measure the SPEED of a vessel through the water or to measure the SPEED of a CURRENT from a vessel at anchor. The l... more A graduated line used to measure the SPEED of a vessel through the water or to measure the SPEED of a CURRENT from a vessel at anchor. The line secured to a LOG. See CURRENT POLE.
	2929	log ship	See LOG CHIP. Also written as one word.
	2930	long baseline acoustic system	An underwater position fixing system which consists of an array of seabed transponders with baselines of several kilometres.
	2931	longitude	ANGULAR DISTANCE, along a PRIMARY GREAT CIRCLE, from the adopted REFERENCE POINT. One of COORDINATES used to describe a POSITION the other b... more ANGULAR DISTANCE, along a PRIMARY GREAT CIRCLE, from the adopted REFERENCE POINT. One of COORDINATES used to describe a POSITION the other being LATITUDE.
	2932	longitude: astronomical	The angle between the plane of the CELESTIAL MERIDIAN and the plane of an INITIAL MERIDIAN, arbitrarily chosen. Astronomical longitude is th... more The angle between the plane of the CELESTIAL MERIDIAN and the plane of an INITIAL MERIDIAN, arbitrarily chosen. Astronomical longitude is the LONGITUDE which results directly from OBSERVATIONS on CELESTIAL BODIES, uncorrected for DEFLECTION OF THE VERTICAL.
	2933	longitude: celestial	ANGULAR DISTANCE east of the VERNAL EQUINOX, along the ECLIPTIC; the arc of the ECLIPTIC or the angle at the ecliptic pole between the CIRCL... more ANGULAR DISTANCE east of the VERNAL EQUINOX, along the ECLIPTIC; the arc of the ECLIPTIC or the angle at the ecliptic pole between the CIRCLE OF LATITUDE of the VERNAL EQUINOX and the CIRCLE OF LATITUDE of a point on the CELESTIAL SPHERE, measured eastward from the CIRCLE OF LATITUDE of the VERNAL EQUINOX, through 360°.
	2934	longitude: geodetic	The angle between the plane of the GEODETIC MERIDIAN and the plane of an INITIAL MERIDIAN, arbitrarily chosen.
	2935	longitude: geographic(al)	A general term, applying alike to ASTRONOMICAL and GEODETIC LONGITUDE.
	2936	longitude: terrestrial	The intercepted arc of EQUATOR, or the angle at the POLE, between the MERIDIAN of a point on the EARTH, and the PRIME MERIDIAN, measured eas... more The intercepted arc of EQUATOR, or the angle at the POLE, between the MERIDIAN of a point on the EARTH, and the PRIME MERIDIAN, measured eastward or westward from the PRIME MERIDIAN through 180° and labelled E or W to indicate the direction of measurement.
	2937	longitude factor	The change in LONGITUDE along a CELESTIAL LINE OF POSITION per 1' change in LATITUDE.
	2938	longitude line	A LINE OF POSITION extending in a generally north-south direction.
	2939	longitude signal	See SIGNAL.
	2940	longitudinal wave	See WAVE.
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