Line across the Yird

An equator is the intersection o a sphere's surface wi the plane perpendicular tae the sphere's axis o rotation an midway atween the poles. The Equator usually refers tae the Yird's equator: an imaginary line on the Yird's surface equidistant frae the North Pole an Sooth Pole, dividin the Yird intae the Northren Hemisphere an Soothren Hemisphere. Ither planets an astronomical bodies hae equators similarly defined. The Equator is aboot 40,075 kilometres (24,901 mi) long; 78.7% is athort watter an 21.3% is ower land.