nunbleman
Long term sun activity and orbital variations and wobble are long known to effect climate. That does not infer seeing planets whiz by. Such an event would be catastrophic. That pesky Newtonian gravity you are so fond of.
There was a long standing puzzle on how early humans got from south to north in Africa. The desert would have been uncrossible. Fairly recently caves were discovered with drawings showing animals, water, and vegetation. It is beloved the desert has been periodically wet due to orbital variations and wobble.
Lets give credit to what you have said, for the benefit of a better understanding.
The last huge earthquake in Chile caused the tilt of earth to move just a little bit. If this little change will cause different climate changes in many places, it is too early to say,but since this earthquake, not necessarily as the cause, rivers all around the world have overflow in raining season, and more.
https://www.cnn.com/2010/WORLD/americas/03/02/chile.quake/index.html
The massive earthquake that struck Chile on Saturday may have shifted Earth's axis and created shorter days, scientists at NASA say.
Here a better link
https://www.nasa.gov/topics/earth/features/earth-20100301.html
The Feb. 27 magnitude 8.8 earthquake in Chile may have shortened the length of each Earth day.
JPL research scientist Richard Gross computed how Earth's rotation should have changed as a result of the Feb. 27 quake. Using a complex model, he and fellow scientists came up with a preliminary calculation that the quake should have shortened the length of an Earth day by about 1.26 microseconds (a microsecond is one millionth of a second).
Well, I personally think that this earthquake might have caused the moving of earth tilt, not only because the 8.8 intensity but because the location of its center.
You must justify a tropical Greenland moving North and become a cold area with an earthquake several times greater than the Chilean earthquake or an outstanding fast motion of plates, or... consider that such change on earth was caused by the close passing by of a celestial body. Frozen mammoths found with chewed food in their mouths wasn't an event happening thru millions of years.
As far as it is known, the ancient people said that events changing eras were caused by a celestial body.
What do you think?
Make your calculations, find your seismic headquarter, and check again your point of view.