The Antikythera Mechanism is a 2,000-year-old mechanical computer salvaged from a Roman shipwreck. Detailed imaging of the mechanism suggests it dates back to 150-100 BC and had 37 gear wheels enabling it to follow the movements of the moon and the sun through the zodiac, predict eclipses and even recreate the irregular orbit of the moon. No other civilization is believed to have created anything as complex for another 1,000 years
I don’t pretend to know anything other than how freakin’ cool this is. I wonder what the world would have been like had this path been followed. I got this information from the Guardian. There is more at Wikipedia.