What is the name of the line at 0 degrees latitude?

The Equator is the line at 0 degrees latitude. It is an imaginary circle around Earth that lies midway between the North and South Poles and divides the planet into the Northern and Southern Hemispheres.

The Equator is the reference line from which latitude is measured. Lines of latitude run east to west, although they describe positions north or south of the Equator. This differs from the Prime Meridian, which is the reference line at 0 degrees longitude and runs from pole to pole through Greenwich, England.

Earth’s rotation causes the planet to bulge slightly at the Equator, making its equatorial diameter greater than its polar diameter. Equatorial regions generally receive strong sunlight throughout the year, but climate varies considerably because altitude, rainfall, ocean currents, and local geography also matter. The Equator crosses countries including Ecuador, Colombia, Brazil, São Tomé and Príncipe, Gabon, Kenya, and Indonesia.