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Apsis - Perihelion Information
Apsis - Wikipedia, the free encyclopedia en.wikipedia.org/wiki/Apsis An apsis (Greek ἁψίς, gen. ἁψίδος), plural apsides (pron.: /ˈæpsɨdiːz/; Greek: ἁψίδες), is the point of greatest or least distance of a body from one of the foci of its elliptical orbit. In modern celestial mechanics this focus is also the center of attraction, which is usuall