Perihelion and Aphelion

Let's consider a light object (such as a planet or a comet) orbiting around a much heavier one (like the Sun, in the solar system). The orbit of this object, described by the three Keplero's laws, will be elliptical. In this orbit, two important geometrical points can be found, the perihelion (the point where the object is nearest to the sun) and the aphelion (the point of this orbit where the object is farthest).

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