Why do solar or lunar eclipses not occur every month?
Answer
The Moon’s orbit is inclined by about 5.1 degrees relative to the ecliptic plane
The Moon's orbital plane is slightly tilted ($5.1^ ext{ extdegree}$) relative to the ecliptic plane, meaning the Moon usually passes slightly above or below the Sun or Earth, preventing monthly alignments.
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The Ecliptic: Crash Course Kids #37.2 - YouTube
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