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111 to 115 of 227 glossary terms
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.
