The Equator

The equator is, as the school books say, “The terrestrial great circle whose plane is perpendicular to the polar axis, it is midway between the poles". It is an imaginary line around the globe, everything north of it we call Northern Hemisphere and everything south of it we call Southern Hemisphere. The circumference of the earth at the equator equals 40.000 kilometers or 21.600 nautical miles or 24.840 statue miles.