Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the inferior planet

An inferior planet is a planet that is closer to the Sun than the Earth is. Only inferior planets have an inferior conjunction and an elongation that never exceeds a maximum value that is smaller than 180 degrees. The inferior planets are: Mercury and Venus. The opposite of an inferior planet is a superior planet.