and during the middle ages?
Medieval and Renaissance writers generally accepted the idea of seven planets
Definition of planet
Medieval and Renaissance writers generally accepted the idea of seven planets
what is the definition of a planet? A planet is a body that orbits the Sun, is massive enough for its own gravity to make it round and has "cleared its neighbourhood" of smaller objects approaching its orbit how were they described during antiquity? Ancient Greek astronomers employed the term "asteres planetai" meaning "wandering stars", to describe those starlike lights in the heavens that moved over the course of the year
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Definition of planet [SEP] Planets in the Middle Ages
Medieval and Renaissance writers generally accepted the idea of seven planets. The standard medieval introduction to astronomy, Sacrobosco's "De Sphaera", includes the Sun and Moon among the planets, the more advanced "Theorica planetarum" presents the "theory of the seven planets," while the instructions to the "Alfonsine Tables" show how "to find by means of tables the mean "motuses" of the sun, moon, and the rest of the planets." In his "Confessio Amantis", 14th-century poet John Gower, referring to the planets' connection with the craft of alchemy, writes, "Of the planetes ben begonne/The gold is tilted to the Sonne/The Mone of Selver hath his part...", indicating that the Sun and the Moon were planets.