“This Persian astrolabe is the oldest complete device with cog wheels to have come down to us. On the front side it is an astrolabe, linked to the calendar by a gear train. On the back, the disc shows the phases of the Moon.”
Happy 2018 everyone!
a favorite foto
Sunday, December 31, 2017
Muhammad ibn Abī Bakr al Ibarī (13th century) Astrolabe with geared calendar, 1221-1222 (Oxford, Museum of the History of Science)
“This Persian astrolabe is the oldest complete device with cog wheels to have come down to us. On the front side it is an astrolabe, linked to the calendar by a gear train. On the back, the disc shows the phases of the Moon.”
Happy 2018 everyone!
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment