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Sigma KEE - Hemisphere
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hemisphere
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Hemisphere is the class of GeographicAreas that are halves of the Earth, as traditionally divided into the Northern and Southern Hemispheres along the equator and into the Eastern and Western Hemispheres along a north_south line running 20�W and 160�E.
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geographic area |
A geographic location, generally having definite boundaries. Note that this differs from its immediate superclass Region in that a GeographicArea is a three-dimensional Region of the earth. Accordingly, all astronomical objects other than earth and all one-dimensional and two-dimensional Regions are not classed under GeographicArea.
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| Instances | eastern hemisphere | The half of the Earth that includes Europe, Asia, Africa, and Australia. |
| | northern hemisphere | The half of the Earth that lies above the equator. |
| | southern hemisphere | The half of the Earth that lies below the equator. |
| | western hemisphere | The half of the Earth that includes North and South America. |
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