A flyby of a comet would not halt the rotation of the earth, nor would it restart the rotation if the earth's rotation were stopped for some other reason.
The earth's magnetic orientation has reversed many times in our geological past. One can read this reversing in the seafloor of the Atlantic Ocean, which is being continously created by plate tectonics (but only an inch or so per year). The last reversal was way before Joshua's long day, by the way.
Would a "hard flip" of the magnetic poles affect the rotation of liquid iron in the core and thus the surface?
Upvote
0