The Milankovitch Theory explains the three cyclical changes in Earth's orbit and tilt that cause the climate fluctuations that occur over tens of thousands of years to hundreds of thousands of years. These fluctuations Fclude changes in the drag and drop answer here (eccentricity) of Earth's orbit every -100,000 years, the drag and drop answer here (obliquity) of Earth's axis every -41,000 years, and the drag and drop answer here (precession) of Earth's axis about -23,000 years. Milankovitch proposed that drag and drop answer here periods began when the three cycles align to favor an extended period of more solar radiation in the winter and less solar radiation in the summer at a latitude of 65°N. These conditions for the northern latitudes favor somewhat higher temperatures, but also more drag and drop answer hele vapor in the air - causing more snowfall. A relatively cool summer for the northern latitudes favors less melting of winter snow and glacier formation