Feynman's lost lecture

About “Feynman's lost lecture”

On March 13, 1964, Richard Feynman gave a lecture to Caltech freshmen titled "The Motion of Planets Around the Sun," explaining why planets move in elliptical orbits. He used only high-school level geometry, a method similar to one used by Isaac Newton in his Principia. Feynman created his own proof after finding Newton's explanation unclear. The lecture focused on a key moment in history that marked the shift from an Earth-centered view of the universe to a modern understanding. This discovery, made by Copernicus, Kepler, Galileo, and Newton, changed humanity's perception of the cosmos. Feynman showed how nature follows mathematical laws, a concept that has fascinated thinkers since Newton's time. For 30 years, the lecture remained in Caltech's archives. It was later reconstructed and explained in detail, along with a history of ideas about planetary motion. The book includes a compact disc and is designed to be accessible to anyone who remembers high-school geometry. It presents a significant moment in the history of science, comparing it to great works of art and music. The lecture highlights the power of mathematics in understanding the natural world.