APHELION (from Gr. ἀπό, from, and ᾔλιος, sun), in astronomy,
that point of the orbit of a planet at which it is most distant
from the sun. Apogee, Apocentre, Aposaturnium, &c. are terms
applied to those points of the orbit of a body moving around a
centre of force—as the Earth, Saturn, &c.—at which it is
farthest from the central body.
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