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The Earth has an equator. The equator goes around the middle of the Earth.

The equator is the circular line that goes around the Earth that is half way between the North and South poles.

The equator is defined by the Earth's rotation and for that matter so are the locations of the North and South poles.

Even without the Sun as a guide, we would know there was an axis of rotation and so we would be able to define the mid-plane perpendicular to that axis half way between the two ends.

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12y ago

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