|
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.
|
