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Earths measurements, starts at the equator. They are the lines that run around the world like a belt. Measures N and S north and south poles are 90 degrees, starts at the prime meridian. They run perpendicular to the equator and meet at the poles. Measures E and W Greenwich is 0 degrees and the international date line is 180 degrees, degrees Longitude starts at the prime meridian. They run perpendicular to the equator and meet at the poles. Measures E and W, degrees which is 1/360th of the way around the sphere, Measurements on a sphere are degrees, degrees Latitude starts at the equator. They are the lines that run around the world like a belt. Measures N and S