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There are 360 degrees of latitude and the latitude line of 0 degrees is known as the Prime Meridian and it divides the world into the Eastern Hemisphere and the Western Hemisphere (-180 degrees degrees of longitude west and 180 degrees of longitude east).
The world is divided into four hemispheres based on lines of latitude and longitude. The equator is an imaginary line that is equidistant from the North and South Poles. This line falls at zero degrees latitude. The part of the Earth that is north of the equator is known as the Northern Hemisphere. The part of the Earth that is south of the equator is known as the Southern Hemisphere. The Western and Eastern Hemisphere are divided by zero degrees longitude which is known as the Prime Meridian.