A great circle is the largest circle that can be drawn on a particular sphere, dividing it into two equal halves. Its radius is equal to the radius of the sphere, and it passes through the center of the sphere. Examples of great circles include the equator on the Earth and the meridians of longitude.
A great circle is the largest possible circle that can be formed on the surface of a sphere. It divides the sphere into two equal halves and its center coincides with the center of the sphere. The circumference of a great circle is always the same as the circumference of the sphere. Examples of great circles include the equator on Earth and lines of longitude that pass through the North and South Poles.
