The Earth’s axis of rotation is at a 23.5 degree angle, not the earth itself. The shape of the earth doesn’t really matter.
Imagine you spin a globe–those two little poles at the top and bottom that hold the globe in place while everything else spins around it is called the axis of rotation. Now if you zoom out to a solar system level, you still see the earth spinning while it orbits the sun. However, you’ll notice that the horizontal line of the earth’s equator does not line up with the line that you would draw if you tried to connect the earth to the Sun–the angle is off. That’s what people mean when they talk about axial tilt. I hope that makes sense?
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