# Great circle

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A **great circle** is a circle on the surface of a sphere that has the same circumference as the sphere, dividing the sphere into two equal hemispheres. Equivalently, a **great circle** on a sphere is a circle on the sphere's surface whose center is the same as the center of the sphere. A **great circle** is the intersection of a sphere with a plane going through its center. A **great circle** is the largest circle that can be drawn on a given sphere.

Every circle formed by lines of longitude is a **great circle** - compare this to latitude where only the equitorial line of latitude is a Great Circle.