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Add post on the theme Discussion club

uploaded by: Daneliya

Description: Musée d'histoire des sciences (MHS) - Genève, Suisse

wood, brass, ivory, Adams, London, around 1775
Inv. 818

This Planetary, animated by a watch movement, represents the Solar system and the movement of its principal planets known at the 18 century. A mechanism used to operate the instrument and run through the gears the mobile disks on which are fixed Mercury, Venus, Earth and Moon. Mars, Jupiter and Saturn are fixed. The planetary includes also the spheres additional, representing the Earth and the Moon. They probably allowed to represent hypothetical situations where the Earth would have its axis of rotation perpendicular to the plane of the ecliptic (the plane of rotation of planets around the Sun).

photo - personal archive

Source of information: MHS
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