This document presents a hypothesis that Earth's motion is the source of light energy in the solar system. The author proposes that Earth's velocity around the sun produces a beam of light equal to the supposed velocity of light. Various equations are presented analyzing distances, velocities, and time periods related to Earth's orbit and the orbits of other planets and celestial bodies. The author concludes that Earth is the source of energy for the entire solar system. References are provided for the author's other works on similar topics analyzing planetary motion and trajectories.