What causes the variation in the exact point on the horizon where the sun appears or disappears outside of the equinoxes?

Answer

The Earth's axial tilt of about 23.5 degrees relative to its orbital plane

The Earth's approximately 23.5-degree axial tilt relative to its orbital plane causes the seasons, which in turn dictate how far north or south of east the sun rises and sets throughout the year.

What causes the variation in the exact point on the horizon where the sun appears or disappears outside of the equinoxes?
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