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Definition of sphere. 1a (1) : the apparent surface of the heavens of which half forms the dome of the visible sky (2) : any of the concentric and eccentric revolving spherical transparent shells in which according to ancient astronomy stars, sun, planets, and moon are setb : a globe depicting such a sphere; broadly : globe a.
The word hemisphere itself specifically means half of a sphere, and since the earth is considered an oblate sphere, a hemisphere is half. Geography and Climate of the Northern Hemisphere. Like the Southern Hemisphere, the Northern Hemisphere has a varied topography and climate.