It is sometimes called the world's oldest computer for its ability to perform astronomy calculations.

The remains of the mechanism were discovered by sponge divers off the Greek island of Antikythera in 1901. According to a study published in the journal Scientific Reports, only a small portion of the original mechanism is still alive today. Around 2200 years ago, it was built.

What did the Antikythera mechanism do?

The mechanism could tell when the Olympics were going to take place, and it could help track the motions of the sun, moon, and five planets. The team wrote that it was a mechanical computer of bronze gears that used ground-breaking technology to make astronomy predictions.

Scholars have been trying to understand the device since it was discovered. Many questions remain unanswered despite the considerable progress they have made. Researchers are unsure of who made it. The mechanism is thought to have been created by the Greek inventor, but this is not certain. The mechanisms are written in Greek.

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Aristeidis Voulgaris told Live Science that whoever made the device had to know a lot about astronomy, metallurgy and mechanology. The aim of this project is to understand the mechanism better. They would have needed a lot of dexterity in their hands.

Engraving illustration of the last hour of Archimedes. Here we see him sitting as a desk, drawing symbols on the floor. He is being interrupted by a soldier entering through the doorway who is carrying a sword and shield.

An engraving illustration of the last hour of Archimedes, the mathematician who died in 212 B.C. or 211 B.C. when the Romans captured Syracuse, Sicily. (Image credit: mikroman6 via Getty Images)

Over the past two decades, scientists have been able to read more of the Greek inscriptions using high tech techniques, such as 3D X-ray scanning. They have been able to learn more about how the mechanism works.

The researchers wrote in the Scientific Reports article that "CT scans revealed inscriptions describing the motions of the sun, moon and all five planets known in antiquity and how they were displayed at the front as an ancient Greek universe." The mechanism was based on Babylonian astronomy, Plato's Academy and ancient Greek theories.

Alexander Jones is a professor of the history of the exact sciences in antiquity at New York University's Institute for the Study of the Ancient World.

What did the Antikythera mechanism look like?

A picture taken at the Archaeological Museum in Athens on September 14, 2014 that shows pieces of the Antikythera Mechanism, a 2nd-century B.C. device known as the world's oldest computer which tracked astronomical phenomena and the cycles of the Solar System. Here we see several items on display, all quite eroded. In the center there is a large piece that has some writing on it in an old language.

More pieces of the Antikythera Mechanism at the Archaeological Museum in Athens. (Image credit: LOUISA GOULIAMAKI/AFP via Getty Images)

The front of the mechanism has a dial that shows the movements of the sun, moon, and Mercury.

The mechanism had a huge array of gears between the front and back of it.

A user of the Antikythera Mechanism might want to check eclipse predictions for a certain month. Tony Freeth, a researcher with the Antikythera Mechanism Research Project, wrote in a paper that the user winds the mechanism forwards to the date they want.

Antikythera mechanism shipwreck

This massive marble head found by the latest excavations at the Antikythera wreck site is thought to represent the Greek demigod Heracles. Here we see a diver underwater examining a very worn marble sculpture head.

This massive marble head found by the latest excavations at the Antikythera wreck site is thought to represent the Greek demigod Heracles. (Image credit: Nikos Giannoulakis/Hellenistic Ministry of Culture and Sports/Swiss School of Archaeology in Greece)

The wreck of the ship that held the Antikythera mechanism has not been excavated. The size of the ship that carried it is not clear, and how much of the artifacts are dispersed is not certain. It's location and depth make it hard to dig. The site is too deep for scuba divers to explore for long but too shallow for remotely operated vehicles to investigate.

Despite these difficulties a new program of excavation is being carried out by a team of archaeologists and new artifacts continue to be found.

Many of the artifacts were meant for the rich. New remains of the mechanism have not been found so far.

Excavations in 2016 at the Antikythera shipwreck found a nearly intact skull, including the cranial parietal bones.

Excavations in 2016 at the Antikythera shipwreck found a nearly intact skull, including the cranial parietal bones. (Image credit: Brett Seymour, EUA/WHOI/ARGO)

Live Science reported at the time that archaeologists found the skeleton of a man at the wreck. Scientists are trying to get more information about the man.

It's not clear why the mechanism was on the ship. Jones said in his book that this was not an object one would casually subject to the risk of travel. The mechanism wouldn't have been a one-of-a-kind device, but it would have been worth a lot. Jones wrote that a storm may have caused the ship to sink and that a technician may have been transporting the device to its owner. Scholars are debating where the ship came from and where it went.

The earliest date on which all calculations are based is still being debated by scholars. December 22, 178 B.C. is the proposed start date for the mechanism. There was a festival dedicated to the goddess Isis on that day as well as a lunar eclipse. Isis was seen as a goddess in Greece at the time.

The most likely start date is May 12th, 204 B.C., since a lunar eclipse would have been visible in Greece. Someone who worked in his workshop could have built this device.

Additional resources

Bibliography

In Scientific Reports 5822, Freeth and his co-authors describe a model of the cosmos in the ancient Greek Antikythera Mechanism.

There is a new tab at the bottom of this article.

"Eclipse prediction on the Ancient Greek Calculating Machine known as the Antikythera Mechanism" was written by Freeth.

There is a new tab on the journal's website.

The Oxford University Press has a book by A. Jones called "A Portable Cosmos: Revealing the Antikythera Mechanism, Scientific Wonder of the Ancient World"

"The Initial Calibration Date of the Antikythera Mechanism after the Saros spiral mechanical Apokatastasis" was written by Voulgaris and his co- authors.

There's a new tab on thearxiv.org.

It was originally published on Live Science