Areal velocity

Areial velocity, often referred to as "areal velocity," is a concept in physics and orbital mechanics that describes the rate at which an object sweeps out area in space over time. This term is frequently associated with the motion of celestial bodies and is derived from Kepler's second law of planetary motion. According to Kepler's second law, a line segment joining a planet and the sun sweeps out equal areas during equal intervals of time.