The theory was developed by Serbian, Milutin Milankovitch in 1924 and they are changes in the Earth's orbit and axis tilt which lead to a change in climate and therefore biome. There are variations in the amount and distribution of solar radiation received by the Earth which results in long term changes in the surface temperature of the Earth.
Impact of orbital changes on solar radiation is relatively small and would only lead to approximately 0.5 Celsius in the global temperature. Milankovitch cycles act as the trigger to major global climate change. Climate feedback mechanisms are needed to sustain change.
Orbital Eccentricity (changes in orbit)
https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwim4N6qnfDKAhWH0xQKHS7XBH8QjB0IBg&url=http%3A%2F%2Fwww.ces.fau.edu%2Fnasa%2Fmodule-3%2Ftemperature-trend-changes%2Fcauses-glaciation.php&psig=AFQjCNEUkvjp58-LZbEleaceSiFAMKQkKw&ust=1455297905173325
Obliquity (changes in tilt)
https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjHr_ihnvDKAhUC6xQKHY_uB5UQjB0IBg&url=http%3A%2F%2Fpics-about-space.com%2Fobliquity-of-earth-orbit%3Fp%3D1&bvm=bv.113943164,d.d24&psig=AFQjCNEf1AYvpKbWPE-poryDipbWlJCzsA&ust=1455298150388111
Precession (Axial wobble)
This happens every 22,000 years.
https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjKq8LgnfDKAhXDbxQKHebfC_wQjB0IBg&url=http%3A%2F%2Fwww.mhhe.com%2Fphyssci%2Fastronomy%2Ffix%2Fstudent%2Fchapter3%2F03f15.html&bvm=bv.113943164,d.d24&psig=AFQjCNF368IerdHMOUv52fgfdKrqhMcXVQ&ust=1455298012745229
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