The planet Earth, like most planets, is approximates in the shape of a
sphere. The poles of a planet are the topmost and bottommost points on
the sphere, while the equator circles the Earth halfway between the two
poles, dividing the planet into two hemispheres. On Earth, our
“topmost” pole is the North Pole, while the South Pole is on the
“bottom” of the planet. The equator therefore divides the planet into a
Northern and Southern hemisphere.