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Perihelion and aphelion
The perihelion and aphelion are the nearest and farthest points respectively of a body's direct orbit around the Sun.
The perihelion is the point in the orbit of a planet, asteroid or comet that is nearest to the sun. It is the opposite of aphelion, which is the point farthest from the sun.
Dates of perihelions :
http://astrometry.ch:5000/perihelion/
How it's made :
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