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	Eng ID	Term	Definition
	2981	loxodromic curve	A LOXODROME. A RHUMB LINE.
	2982	lubber (or lubber's) line	A REFERENCE LINE on any direction-indicating instrument, marking the reading which coincides with the HEADING.
	2983	lull	A momentary decrease in the SPEED of the WIND.
	2984	lumen	The unit of LUMINOUS FLUX in the SI SYSTEM.
	2985	luminance (at a point of surface, in a direction)	Quotient of the LUMINOUS INTENSITY, in a given direction, of an infinitesimal element of the surface containing the point under consider... more Quotient of the LUMINOUS INTENSITY, in a given direction, of an infinitesimal element of the surface containing the point under consideration, by the orthogonally projected area of the element on a plane perpendicular to the given direction.
	2986	luminescence	Any emission of light at temperatures below that required for incandescence. See BIOLUMINESCENCE, FLUORESCENCE, PHOSPHORESCENCE.
	2987	luminous flux	See FLUX.
	2988	luminous intensity	See INTENSITY.
	2989	luminous range	See RANGE.
	2990	luminous signal	See SIGNAL.
	2991	lunar day	See DAY.
	2992	lunar distance	The angle, at an observer on the EARTH, between the MOON and another CELESTIAL BODY. This was the basis of a method formerly used to deter... more The angle, at an observer on the EARTH, between the MOON and another CELESTIAL BODY. This was the basis of a method formerly used to determine LONGITUDE at SEA.
	2993	lunar eclipse	See ECLIPSE.
	2994	lunar inequality	Variation in the MOON's motion in its ORBIT, due to attraction by other bodies of the SOLAR SYSTEM. See EVECTION, PERTURBATION. A minute flu... more Variation in the MOON's motion in its ORBIT, due to attraction by other bodies of the SOLAR SYSTEM. See EVECTION, PERTURBATION. A minute fluctuation of a MAGNETIC NEEDLE from its mean position, caused by the MOON.
	2995	lunar month	See MONTH: SYNODICAL.
	2996	lunar rainbow	See MOONBOW.
	2997	lunar tide	See under TIDE.
	2998	lunation	See MONTH: SYNODICAL.
	2999	lunicurrent interval	The interval between the moon's transit (upper or lower) over the local or Greenwich meridian and a specified phase of the tidal current fol... more The interval between the moon's transit (upper or lower) over the local or Greenwich meridian and a specified phase of the tidal current following the transit. Examples are strength of flood interval and strength of ebb interval, which may be abbreviated to flood interval and ebb interval, respectively. The interval is described as local or Greenwich according to whether the reference is to the moon's transit over the local or Greenwich meridian. When not otherwise specified, the reference is assumed to be local.
	3000	lunitidal interval	The interval of time between the TRANSIT (upper or lower) of the MOON over the LOCAL or GREENWICH MERIDIAN and the next HIGH WATER or LOW WA... more The interval of time between the TRANSIT (upper or lower) of the MOON over the LOCAL or GREENWICH MERIDIAN and the next HIGH WATER or LOW WATER at a place. The interval is assumed to be local unless otherwise specified. The average of all high water intervals is called mean high water lunitidal interval, high water interval, or corrected establishment. The average of all low water intervals is called mean low water lunitidal interval, or low water interval. The expressions higher high water interval, lower high water interval, higher low water interval, and lower low water interval are used when there is considerable DIURNAL INEQUALITY. See ESTABLISHMENT.
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