The Earth is 360 degrees around the equator. This equates to 2 Pi Radians. One radian is the angle the radius of a circle makes from the center point of that circle. So 2 Pi Radians is equivalent to 360 degrees. If we divide the earth into 24 hours, each hour has 60 minutes and each minute has 60 seconds. The distance between the North Pole and the Equator is about 24,900 miles. If we divide 24,900 by 360, we get about 70.73 miles.