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• 23.5° tilt of the Earth relative to its orbit around the Sun.
• The orientation of this tilt stays more or less fixed with respect to the stars, NOT the Sun (but see procession)
• Therefore different parts of the Earth receive more sunlight (longer per day and more direct) depending on the season

Looking closely at the above you can see that there are times of the year when the Sun shines more directly in the North or South. This is why we have seasons!

Looking at the above comparison shows that the angle of the Sun changes a lot (47°!) between the longest and shortest days of the year.

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