Kantianism
Kantianism is the philosophy of Immanuel Kant, a German philosopher born in Königsberg, Prussia (now Kaliningrad, Russia). The term "Kantianism" or "Kantian" is sometimes also used to describe contemporary positions in philosophy of mind, epistemology, and ethics.
Immanuel Kant
Kant is best known for his work in the philosophy of ethics and metaphysics, but he made significant contributions to other disciplines. He won the Berlin Academy Prize in 1754 for his argument that the Moon's gravity would eventually cause its tidal locking to coincide with the Earth's rotation. The next year, he expanded this reasoning to the formation and evolution of the Solar System in his "Universal Natural History and Theory of the Heavens".
In the "Universal Natural History", Kant laid out the Nebular hypothesis, in which he deduced that the Solar System had formed from a large cloud of gas, a nebula. Kant also correctly deduced that the Milky Way was a large disk of stars, which he theorized formed from a much larger spinning gas cloud. He further suggested that other distant "nebulae" might be other galaxies. These postulations opened new horizons for astronomy, for the first time extending it beyond the Solar System to galactic and intergalactic realms. According to Thomas Huxley (1867), Kant also made contributions to geology in his "Universal Natural History", and according to Lord Kelvin (1897), he made contributions useful to mathematicians and astronomers.