Template:Selected anniversaries/October 20
From Gnomon Chronicles
1631: Astronomer and mathematician Michael Maestlin dies. He was a mentor to Johannes Kepler, and played a sizable part in his adoption of the Copernican system.
1916: Time-travelling physician-warrior Asclepius Myrmidon arrives during a artillery barrage in western Europe, sets up emergency field hospital.
Artificial intelligence based on the Golden ratio develops genuine gratitude for Michael Maestlin's approximation of the Golden ratio.