English: Illustration of Newton's geometrical proof that a moving particle sweeps out equal areas in equal times if and only if the force acting on it at the point B is a central force. Newton discretizes the equations of motion as the leapfrog (Verlet) integration method; here, the triangle OAB has the same area as the triangles OBC and OBK.
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{{Information |Description={{en|1=Illustration of Newton's geometrical proof that a moving particle sweeps out equal areas in equal times if and only if the force acting on it at the point '''B''' is a central force. Newton discretizes the equations of m