Question

what is hemisphere one sentence
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Answer 1

Answer:

Any circle drawn around the Earth divides it into two equal halves called hemispheres. There are generally considered to be four hemispheres: Northern, Southern, Eastern, and Western. The Equator, or line of 0 degrees latitude, divides the Earth into the Northern and Southern hemispheres.

Answer 2

Answer:

a half of the celestial sphere as divided into two halves by the horizon (see HORIZON sense 1b), the celestial equator, or the ecliptic