11/12世紀につくられた図で、太陽、月、惑星の運動を表したものとのこと。
A bookworm's favourite: this 11th/12th-century diagram representing relative motions of the sun, the moon + planets has several wormholes where an insect nibbled its way through: https://t.co/BuDUTjkePH#MedievalScience#PolonskyPre1200
— A V Hudson (@wyrdwritere) August 18, 2018
Royal MS 13 A XI, f. 143v pic.twitter.com/XOk3F7a3Ee
