Gravitation and Angular Momentum

This lecture covers the conservation of angular momentum, gravitational fields, Kepler's movements, Newton's law of gravity, and the relationship between central force and angular momentum. It explains how Newton deduced gravity from Kepler's laws and emphasizes the importance of close observations of planetary movements. The lecture also discusses the elliptical trajectories of planets, the central force exerted by the sun, and the implications of the laws of areas and ellipses in celestial mechanics.