Kepler's Three Laws

Although his studies of the Martian orbit were beneficial, the most important subject of his work were his three laws of planetary orbits, which were based on pure science, discovery and observation. These laws were not based on religion or religious concepts, which is the theme of Secularism. Although Kepler was a devoted Lutheran, his three laws of planetary orbit were purely scientific.

A monument in Austria dedicated to Kepler; the monument highlights his second law, the Law of Areas. (Britannica)