The Antikythera Mechanism has been baffling scientists and archaeologists all across the globe since the day it was first discovered in 1901 in the a shipwreck found in the waters of the Aegean sea not far from Crete. With around 80 pieces still intact, the Antikythera Mechanism revealed the Ancient Greek civilization to be much more technologically advanced than everyone thought.
In fact, the Antikythera Mechanism, which dates 2,000 years back, is believed to be the most complex clockwork mechanism ever created and not only in ancient history, but in modern times as well! It was so elaborate, that with so many pieces still missing, it's nearly impossible to recreate this ancient 'computer' today.
Still, the scientists gave it a try, using all the remaining pieces of the mechanism and the idea behind what each of them meant - they could make out some of the inscriptions on the gears to get the gist of this ancient calculating device, and this is what they came up with!
It turns out this ancient computer was 'turned on' somewhere around Dec. 22, 178 B.C., at least that's what they scientists are theorizing about. That was the day of a long solar eclipse with winter solstice happening on the following day, making it a perfect date to kick off the astrological calculations performed by this device. Scientists believe it was an elaborate time-measuring instrument that was used to calculate various important astrological events like solar and lunar eclipses, equinoxes, and different festivals that often coincided with phases of the moon.