Main Question or Discussion Point
What would Earth be like with a 45 degree tilt?
But you'll get a lot more sun at the poles on average and less in the tropics.If Earth had a 45 degree tilt, everything north of 45 degrees (even Seattle, Washington) would technically be in the arctic circle, and everything south of 45 degrees would be in the antarctic circle (which surprisingly adds little more than the southern tips of south America and New Zealand). You could see the midnight sun in Paris on a summer day.
The weather at the poles would also be more extreme. The polar winters would be even harsher than they are now because for months at a time even more land and see would never see sunlight.
um, no, i don't think that is the case.But you'll get a lot more sun at the poles on average and less in the tropics.
The angle of incidence is very important in terms of ground heating. The poles would experience a 45 degree angle of incidence at the summer solstice compared to the 23 degree maximum angle that actually occurs. Meanwhile the sub-solar point would dip to 45 N&S at the solstices meaning the angle of incidence at the equator at noon is 45 degrees at each solstice compared to the about 90-23= 67 degrees that actually occurs.um, no, i don't think that is the case.
assuming that the Earth would continue to spin and continue to revolve around the sun, every spot on Earth would see the sun 50% of the time on average as each spot does now. this is not to say that some spots on Earth don't get a more direct hit from the sun at noon.
It's precession of the equinoxes would likely also be more extreme. Precession is one factor that has been attributed to the cause of ice ages. See Milankovich Cycles:What would Earth be like with a 45 degree tilt?
While this is true, I think a 45 degree tilt would work against an ice age. The key to continental glaciation is a perennial snow pack. With the amount of insolation over the polar regions due to the sun circling at high angles (peaking at 45 degrees at the solstice), it's unlikely that significant winter snow could survive though the summer even with the other conditions preceding the last ice age. Your reference pointed out the importance of temperatures in July at 65 degrees N. Note the 45th parallel would correspond not only to the Arctic circle, but also the Tropic of Cancer in the northern hemisphere. The sub-solar point would be only 20 degrees south of the of the 65th parallel at the solstice.It's precession of the equinoxes would likely also be more extreme. Precession is one factor that has been attributed to the cause of ice ages. See Milankovich Cycles: