Magellanic Clouds. Three masses of whitish nebulae near south pole of celestial concave.
Magnet. Body or substance having the property of attracting iron and steel. Usually iron or steel, but may be cobalt or nickel. Can have natural magnetism or electrically-induced magnetism.
Magnetic Amplitude. Angle of bearing measured from east or west point of a compass whose needle lies in magnetic meridian.
Magnetic Azimuth. Angle east or west of magnetic meridian and expressed in degrees.
Magnetic Bearing. Bearing of an object when referred to a compass whose needle lies in magnetic meridian.
Magnetic Compass. Compass whose directional property is due to its needles seeking the magnetic meridian.
Magnetic Compensation. Introduction of soft iron or magnets in the vicinity of a compass so that magnetic effects of iron or steel in ship or cargo can be neutralised or reduced. Magnetic Dip. Vertical angle that a freely-balanced magnetic needle would make with the horizontal plane at a given place.