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MapTerminology

Terms

Definition

A.M.

Ante Merdian - "before noon"

P.M.

Post Merdian - "after noon"

Atlas

A book of maps.

Equator

The earth's base line and point of it's widest circumference.

Graticles

Any organized framework of latitude and longitude used for maps.

Latitude

How far north or south of the equator a coordinate lies. 0 degrees = the equator.

Longitude

How far east or west of the zero meridian a coordinate lies. 0 degrees = the prime meridian; usually Greenwich, England.

Meridian

The lines running vertically around the globe from pole to pole.

Parallels

The lines running horizontally around the globe. 0 degrees = the equator. 90 degrees = north pole

Prime Meridian

Noon in Greenwich, England is the generally accepted prime meridian. But a world power can define their meridian anywhere they want. Example: You may see Tokyo at the 0 degree point on a map of Japan, but it is 139 degrees east of Greenwich, England.

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