A century ago, on July 7, 1909, the thread of life of the talented young scientist Walter Ritz, who managed to do a lot in science in 31 years of his life, was cut short. To this day, the Ritz combination principle is used in spectroscopy, and the Ritz variational method is used in physics, mathematics and technology. However, his other even more important scientific developments were consigned to oblivion due to their discrepancies with the tenets of the theory of relativity and quantum physics. These are the ballistic theory and magnetic model of the atom developed by Walter Ritz in 1908, a year before his death. The sudden tragic death of the scientist prevented him from completing and proving these fundamental concepts of light and atoms, electromagnetism and gravity. As a result, Ritz's name and theories were soon forgotten, although it was the ballistic theory that easily, beautifully and clearly explains many of the mysteries of nature. In order to restore historical justice and recall the undeservedly forgotten scientific and life feat of Walter Ritz, this book was written, where the author popularly outlined and developed the Ritz Ballistic Theory, taking into account the level of modern science.