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hemispheres 
The globe is divided by convention into four half spheres, using the Greenwich meridian or the Equator as a reference point.
Southern hemisphere
Southern half of the globe in relation to the Equator.
Western hemisphere
Western half of the globe in relation to the prime meridian.
Northern hemisphere
Northern half of the globe in relation to the Equator.
Eastern hemisphere
Eastern half of the globe in relation to the prime meridian.
