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106 to 115 of 227 glossary terms
level: name for different types of instrument used in surveying for determining the horizontal direction and differences in height, and in gunnery and elsewhere for adjusting something to the horizontal. See also gunner's level.
level and sight: instrument used to set a large gun to the horizontal, or to elevate and aim it on a target, see article on the gunner's sight and level.
limb: the outermost part or edge of a circular or part-circular instrument carrying a scale, usually divided in degrees.
longitude: angle parallel to the equator to indicate position on the earth. The celestial longitude, however, is an angular distance parallel to the ecliptic.
lunar dial: dial where the shadow is cast by moonlight instead of sunlight, see article on the sundial.
lunar volvelle: volvelle indicating the age of the moon, which typically converts between the time indicated by the shadow of the moon on a sundial and solar time.
magic square: square grid with a number in each cell for which the sum of each row, column and diagonal is the same.
magnetic compass: instrument indicating directions by a magnetic needle, see article on the compass.
magnetic deviation: the angle between geographical north and the direction indicated by a compass needle.
magnitudes: numbers in a scale of the relative brightnesses of the stars, 1 being the brightest.
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