World's first computer, the Antikythera Mechanism, 'started up' in 178 B.C., scientists claim

oblong golden box with circular layers visible inside and out
This 1970s reconstruction of the Antikythera Mechanism was designed by Derek de Solla Price and constructed by R. Deroski. (Image credit: Have Camera Will Travel | Europe / Alamy )

The mysterious Antikythera mechanism (opens in new tab), thought by some to be the world's first computer, was first "started up" on Dec. 22, 178 B.C., archaeologists have now found.

Discovered by sponge divers in a Roman-era shipwreck near the Greek island of Antikythera in 1901, the elaborate ancient computer, which looks like a shoebox-size contraption with gears and dials that have numerous tiny inscriptions written on them, could predict eclipses and determine when various athletic games took place, among other functions.  

Over the years, researchers have painstakingly pieced together the many fragments of the Antikythera mechanism to figure out how it was created and how it would have been used 2,000 or so years ago. There are many questions plaguing the device: Who made it? Where did they live? Why create it and what start date did it have? Now, a team of scientists has determined that "turn on" date, detailing their findings online March 28 on the preprint database arXiv (opens in new tab), an online journal where research can be uploaded before peer review. 

However, scientists not affiliated with the study cast doubt on this claim, telling Live Science that the start date was probably in 204 B.C. 

Finding a start date

This image shows a reconstruction of the Antikythera mechanism. (Image credit: Aristeidis Voulgaris)

This initiation date matters because it is the date in which all calculations using the mechanism would be based on. "In order to use a measuring instrument, a reference point is needed, before the measuring procedure," the researchers wrote in the paper. Like a calendar which needs a fixed date — such as A.D. 1 — whoever used the mechanism would need a starting date on which to base all calculations.   

The date is one of the mysteries regarding the mechanical marvel that remains to be solved. Previous research has succeeded in deciphering many of the inscriptions and understanding what many of the gears and dials were used for. In 2021, a team of scholars announced (opens in new tab) the creation of a computer model of the mechanism that they believe is accurate. 

Scholars react

Live Science reached out to several scholars not affiliated with the research to get their thoughts on the team's findings. Many were not able to respond at press time, but those who did were skeptical.  

"It's not a paper that would withstand competent peer-review," Alexander Jones, a professor of the History of the Exact Sciences in Antiquity at New York University's Institute for the Study of the Ancient World, said in an email. "There are a lot of problems with it, ranging from major issues to minor ones that nevertheless are symptomatic of lack of good grounding in the broad context of ancient astronomy and science," Jones said. 

For instance, Jones pointed out that this start date would put Kraneios, a season inscribed on the Antikythera mechanism that is associated with wine, in the month of February, which is "not a particularly good month for ripe grapes," Jones said. 

Two papers published (opens in new tab) in 2014 showed that the starting date was in 204 B.C., Jones added. Those two papers showed "that the eclipse prediction sequence had been computed for a unique 223-lunar-month interval beginning in 204 B.C.," Jones said. This was timed to start on May 12 204 B.C. and start and end with a lunar eclipse.   

Originally published on Live Science. (opens in new tab)

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