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As I understand it, the Pleistocene ice ages were dictated by three major factors suggested by the Serbian geophysicist Milutin Milankovitch--eccentricity (orbital shape), obliquity (axial tilt) and precession (direction of rotation in relation to fixed stars).

The one identical factor between our Earth and this alternate Earth is the eccentricity--no lower than 0.000055 and no higher than 0.0679 over a period of 100,000 years.

Back home, Earth's axial tilt varies between 22.1 and 24.5 degrees in a period of 41,000 years. In this alternate Earth, the tilt varies between 20 and 25 degrees in a period of 61,500 years.

Back home, Polaris will be the North Star for a total length of roughly 26,000 years. In this alternate Earth, Alioth in the Big Dipper will be the North Star for a total length of 46,800 years.

With these changes, how would Earth's climate been different? How would these changes affect the extents of the ice ages?

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closed as off-topic by arkaia, Jan Doggen, Daniel Griscom, farrenthorpe, Pont Dec 17 '15 at 21:45

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about earth science, within the scope defined in the help center." – arkaia, Jan Doggen, Daniel Griscom, farrenthorpe, Pont
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ I think this question belongs in worldbuilding.stackexchange.com $\endgroup$ – arkaia Dec 16 '15 at 3:25
  • $\begingroup$ It's been dismissed as broad. $\endgroup$ – JohnWDailey Dec 16 '15 at 3:52
  • $\begingroup$ Maybe instead of changing sites, you could try to rephrase the question in a more specific way. Good luck $\endgroup$ – arkaia Dec 16 '15 at 14:50
  • $\begingroup$ Rephrase it how? $\endgroup$ – JohnWDailey Dec 16 '15 at 15:23
  • $\begingroup$ Ask about the specific effects you are looking for. There are many aspects to planetary climate and being specific in the effects you are considering, shows you have done some of the leg work. $\endgroup$ – arkaia Dec 16 '15 at 15:27