Inferior-planet meaning

Either of the planets Mercury or Venus, whose orbits lie between Earth and the sun.
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Either of the planets Mercury or Venus, whose orbits lie between Earth and the Sun. Because these planets lie in the general direction of the Sun, they can only be seen a few hours before sunrise or after sunset and are always positioned relatively near the horizon, never overhead. Inferior planets go through a complete cycle of phases as viewed from Earth, although their full phase, which occurs on the far side of the Sun, is lost in its glare.
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A planet that orbits the Sun within the orbit of the Earth, and thus does not show retrograde motion when viewed from Earth.
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