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QUESTION
What is the difference between a perihelion and a aphelion?
Perihelion and aphelion refer to the position of a planet relative to it's parent star.
When the planet in it's orbit is at the position closest to it's parent star it is said to be at the perihelion . When the planet in it's orbit is at the position farthest to it's parent star it is said to be at the aphelion .
