Dutch scientist Christiaan Huygens (1629-1695) left an indelible mark on the fields of mathematics, physics, astronomy, and geophysics. Despite his groundbreaking contributions, history has often overlooked his pivotal role. While two of the most famous achievements in physics are Newton's theory of gravity and Einstein's general theory of relativity, less well-known is that Huygens provided central elements to these theories. This book stands...