Persephone vs Axis Tilt
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[T]he true explanation of seasons [says] that the Earth’s axis of rotation is tilted relative to the plane of its orbit around the sun. Hence for half of each year the northern hemisphere is tilted towards the sun while the southern hemisphere is tilted away, and for the other half it is the other way around. Whenever the sun’s rays are falling vertically in one hemisphere (thus providing more heat per unit area of the surface) they are falling obliquely in the other (thus providing less).
[S]urfaces tilted away from radiant heat are heated less than when they are facing it, and … a spinning sphere in space points in a constant direction.