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The Equator, Prime Meridian, Tropic of Cancer and Tropic of Capricorn are imaginary lines.

Equator: Located at zero degrees latitude, (North or South) is 24, 901.55 miles long and divides the Planet Earth into the Northern and Southern Hemispheres.

Tropics of Cancer and Capricorn: Located at 23.5 degrees North and/or South of the Equator, this area of Planet Earth between the two lines is known as the "Tropics," and it is indicated with a lighter blue. This area experiences no dramatic change in season because the sun is high in the sky.

People living North of the Tropic of Cancer and South of the Tropic of Capricorn experience dramatic seasonal climate changes. Based on the angle of the sun, when it's summer North of the Tropic of Cancer, it's winter South of the Tropic of Capricorn. (Note the reverse is also true)

Prime Meridian: Located at zero degrees longitude, (East or West), divides the Planet Earth into the Eastern and Western Hemispheres.