OK, if the Earth's tilt doesn't change, than why do we have changing seasons? Wouldn't it be one season all year long at a specific point on Earth? OK, stop reading for a few seconds and think about it.
Maybe a little head scratching is required?
Then again, maybe a pencil placed near the brain will help stir up the thinking process.
I think this kid has it. . . well, maybe not:
I can see that this last guy also has nothing:
OK, the diagram below should make things clear. The Earth always has a 23.5 degree tilt but the tilt always point in the same direction as shown here:
If the Earth's axes rotated and always point toward the sun, we wouldn't have any change of seasons. Now, I am wondering if that had been the case, how would life on Earth had evolved in that scenario? OK, I guess I have that to wonder about the rest of the day. Now, you all have a great day, you hear?