Why Equator Is Called A Great Circle?

The great circle is the base of the hemisphere, as shown in the diagram.

Why can the Tropic of Capricorn not be a great circle?

The earth is not a perfect sphere, but we can think of it as one. The Equator is a great circle, but the Tropics of Cancer and Capricorn are not (they are smaller than the Equator). … Because they show us the shortest routes between two points on a sphere.

Is the equator a small circle?

The shortest distance between any two points on the earth’s surface is attained along the arc of a Great Circle. Small Circles are lines that do not pass through the center of the earth. All Parallels other than the Equator are Small Circles.