At a time only two, but in general, infinitely many.
If, for example, you consider the earth as a sphere, there are the Northern and Southern hemispheres, as well as the Eastern and Western hemispheres. But you could also have the Northeastern and Southwestern hemispheres with the dividing line being the equator rotated through 45% in a plane perpendicular to the Greenwich meridian. Any other angle would also do. And the equator could be rotated through all angles in a plane perpendicular to any meridian.
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Its circumference divides a sphere into hemispheres.
We get two hemispheres.
hemispheres
An equator is a circle that divides the surface of an object into two equal halves. The term is usually used to explain the circle that divides a plane,t like the Earth, in to two hemispheres.
Sphere is one syllable: sphere.