Horizontal direction expressed as angular distance from magnetic north. magnetic diurnal variation. Oscillations of the earth’s magnetic field which have a periodicity of about a day and which depend to a close approximation only on local time and geographic latitude. Also called MAGNETIC DAILY VARIATION.



Related Terms

MAGNETIC DIP

Angular distance between the horizontal and the direction of a line of force of the earth’s magnetic field at any point. Also called DIP, MAGNETIC INCLINATION.

TRUE DIRECTION

Horizontal direction expressed as angular distance from true north.

GREAT CIRCLE DIRECTION

Horizontal direction of a great circle, expressed as angular distance from a reference direction.

COMPASS DIRECTION

Horizontal direction expressed as angular distance from compass north

RELATIVE DIRECTION

Horizontal direction expressed as angular distance from heading.

GRID DIRECTION

Horizontal direction expressed as angular distance from grid north. Grid direction i

MERCATOR DIRECTION

Horizontal direction of a rhumb line, expressed as angular distance from a reference direction. Also called RHUMB DIRECTION.

GREATEST ELONGATION

The maximum angular distance of an inferior planet from the sun before it starts back toward conjunction, as observed from the earth. The direction of the body east or west of the sun is usually specified, as greatest elongation east (or west).

MAGNETIC LATITUDE

Angular distance north or south of the magnetic equator. The angle is equal to an angle, the tangent of which is equal to half the tangent of the magnetic dip at the point.

GREAT CIRCLE COURSE

The direction of the great circle through the point of departure and the destination, expressed as the angular distance from a reference direction, usually north, to the direction of the great circle. The angle varies from point to point along the great circle. At the point of departure it is called initial great circle course; at the destination it is called final great circle course.

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