Which line is used to designate the Equator?

The Equator is designated by lines of latitude, which are the horizontal lines that run parallel to the Equator itself. Latitude measures the distance north or south of the Equator, which is situated at 0 degrees latitude. This is a fundamental concept in geography used for navigation and mapping, as it helps to define the position of various locations on the Earth's surface.

In contrast, longitude refers to the vertical lines that run from the North Pole to the South Pole, determining the distance east or west of the Prime Meridian, which is set at 0 degrees longitude. The Prime Meridian and the Tropic of Cancer, on the other hand, refer to specific lines that serve different purposes; the Prime Meridian divides the Earth into eastern and western hemispheres, while the Tropic of Cancer marks the northernmost point where the sun can be directly overhead during the summer solstice. Thus, the identification of the Equator relies solely on latitude, affirming that it is the correct designation for this specific geographical marker.