Milankovitch Publishes Orbital Climate Theory

Serbian mathematician Milutin Milankovitch published Canon of Insolation and the Ice Age Problem, a 650-page work connecting Earth's orbital variations to glacial cycles. The book detailed how changes in orbital eccentricity, axial tilt, and precession alter solar radiation received at different latitudes over thousands of years. Published in Belgrade as German bombs struck the city's printing plant, the final thirty-two pages had to be reprinted after the initial copies were destroyed during the Yugoslav invasion.