The Antikythera mechanism (also known as the Antikythera Device), dated to the late 2nd century/early 1st century BCE (roughly 205-60 BCE) is understood as the world's first analog computer, created to accurately calculate the position of the sun, moon, and planets. It was found in 1901 off the Greek island of Antikythera, giving it its name.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Antikythera_Mechanism/.