Sunday, December 31, 2017
Be gentle with yourself. You are a child of the universe no less than the trees and the stars; you have a right to be here. — Sylvia Plath
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!
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