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The term planet is ancient, with ties to history, astrology, science, mythology, and religion.Several planets in the Solar System can be seen with the naked eye.
This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit.
To the Greeks and Romans there were seven known planets, each presumed to be circling Earth according to the complex laws laid out by Ptolemy.
They were, in increasing order from Earth (in Ptolemy's order): the Moon, Mercury, Venus, the Sun, Mars, Jupiter, and Saturn.
In the 3rd century BC, Aristarchus of Samos proposed a heliocentric system, according to which Earth and the planets revolved around the Sun.
The geocentric system remained dominant until the Scientific Revolution.