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limb: the outermost part or edge of a circular or part-circular instrument carrying a scale, usually divided in degrees.
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longitude: angle parallel to the equator to indicate position on the earth. The celestial longitude, however, is an angular distance parallel to the ecliptic.
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lunar dial: dial where the shadow is cast by moonlight instead of sunlight, see article on the sundial.
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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.
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magic square: square grid with a number in each cell for which the sum of each row, column and diagonal is the same.
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