The terms "inferior planet" and "superior planet" were originally used in the
Ptolemaic cosmology to differentiate those planets (
Mercury and
Venus) that were between the stationary
Earth and the orbiting
Sun from those planets (
Mars,
Jupiter, and
Saturn), which lay beyond the Sun's orbit. In the 16th century, the terms were modified by
Copernicus, who rejected Ptolemy's
geocentric model, to distinguish a
planet's
orbit's size in relation to the
Earth's. "Inferior planet" is used in reference to
Mercury and
Venus, which are closer to the
Sun than the Earth is."Superior planet" is used in reference to
Mars,
Jupiter,
Saturn,
Uranus,
Neptune, and all the known
minor and
dwarf planets, including
Ceres and
Pluto, which are farther from the Sun than the Earth is.
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