How is the Earth’s equator defined in relation to the ecliptic plane?
Answer
It is tilted $23.5^ ext{o}$ away from the ecliptic plane
The Earth's equator is geometrically defined as the projection of its rotation axis onto the orbital plane (the ecliptic). Since the axis is tilted $23.5^ ext{o}$, the equator shares that same tilt relative to the ecliptic.
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