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inferior and superior planets
Inferior planets are planets whose orbits lie within the orbit of Earth; superior planets planets whose orbits lie outside the orbit of Earth.
== History ==
These terms were originally used in the geocentric cosmology of Claudius Ptolemy to differentiate as inferior those planets (Mercury and Venus) whose epicycle remained co-linear with the Earth and Sun, and as superior those planets (Mars, Jupiter, and Saturn) that did not.
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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