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aphelion vs. perihelion
[ uh-fee-lee-uhn, uh-feel-yuhn, ap-hee-lee-uhn ]
- the point in the orbit of a planet or a comet at which it is farthest from the sun.
[ per-uh-hee-lee-uhn, -heel-yuhn ]
- the point in the orbit of a planet or comet at which it is nearest to the sun.