September 22, 2016

"Sunspots were examined in detail by telescope in the early 1600s, after some 200 years of repeated viewing by unaided eyes in Athens, China, Japan, and Russia. It was difficult for Europeans to see sunspots at all because Aristotle had said that celestial bodies were perfect and without blemish, a fancy which became official church doctrine in the middle ages."
Edward Tufte, from "Envisioning Information"
Luckily then came Galileo. This is why doctrine is kind of terrible. Any source of information and guidance needs to have a corrective mechanism.