What causes the Sun’s apparent path (the Ecliptic) to cross the celestial equator at an angle, leading to seasonal changes?
Answer
The tilt of the Earth's axis.
The variation in solar altitude experienced as seasons change is directly caused by the Earth's axial tilt, which makes the Ecliptic cross the celestial equator at an angle.
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The Ecliptic: Crash Course Kids #37.2 - YouTube
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