クリスティーズさんのインスタグラム動画 - (クリスティーズInstagram)「A mechanical model of the Solar System, this magnificent orrery is a didactic astronomical instrument invented during the age of Enlightenment. 🪐⠀ .⠀ It takes its name from an instrument made in 1712 by John Rowley for Charles Boyle, the fourth Earl of Orrery (1676-1732).⠀ .⠀ The earliest devices were restricted to a demonstration of only the Sun-Earth-Moon system while the present instrument was expanded to include the most recently discovered planets.⠀ .⠀ The signed plate is engraved with calendrical and zodiac scales, a crank-handle actuates the working mechanism for seven planets, Saturn with seven satellites and Uranus with six.⠀ .⠀ A Brass Orrery, Thomas Harris & Son, c. 1820. Estimate: £50,000 - £80,000.⠀ .⠀ Valuable Books and Manuscripts — 9 December, London.⠀⠀ .⠀⠀ #orrery #solarsystem #thomasharris」12月5日 4時27分