Several parameters of the Earth position regarding the Sun vary across the history. I guess that with this combined to cosmic influences and the sun power fluctuations we have a complex model of the earth climate.
Here is a video explaining Milankovitch Cycles:
https://youtu.be/PFfwIOzVlh8
Here is a video explaining Milankovitch Cycles:
https://youtu.be/PFfwIOzVlh8
1. Milankovitch's theory was more or less ignored until 1976
2. Studies of deep-sea sediment cores demonstrated a correspondence between periods of climate change and the Milankovitch cycles
3. Examination of temperature changes going back 450,000 years disclosed that major variations in climate were closely associated with variations in the Milankovitch cycles
4. In particular, the cycle of Ice Ages closely matched the theories of Milankovitch.
5. The cycles do not explain everything, and some inconsistencies remain to be explained