How could a planet have one hemisphere way warmer than the other without the planet being tidally locked?
I would like a planet that's a tropical paradise on one side but covered in ice and glaciers on the opposite side, whether it be the Southern-Northern or the Western-Eastern hemisphere.
I know it would be theoretically possible by making the planet tidally locked to its star but I'd like to avoid that because I want normal day and night cycles and a normal year length (26 Earth hours long days and an orbital period of 390 Earth days).
How could I make all of that happen?
The cold side would need to be a near desert, or in a few hundreds of years all the water would be trapped in the ice on …