A tangle of corroded bronze gears, pulled from a shipwreck by sponge divers in 1901, sat largely unexamined for decades. It turned out to be a working astronomical calculator built more than 2,000 years ago.
Discovery
The Antikythera Mechanism was recovered in 1901 from an ancient shipwreck near the Greek island of Antikythera, first identified as a significant artifact by archaeologist Valerios Stais in 1902. Researchers estimate the device dates to around 100 BCE, likely built by Greek scientists, and would have originally been housed in a wooden case roughly the size of a mantel clock.
What It Does
The mechanism uses an intricate system of interlocking bronze gears, operated by a hand crank, to track astronomical positions and cycles. Dials on its face displayed the positions of the sun, moon, and five visible planets — Mercury, Venus, Mars, Jupiter, and Saturn — along with the moon's phase, and could predict solar and lunar eclipses. A separate dial functioned as a calendar, and researchers believe it may also have tracked the four-year cycle of Panhellenic athletic games, including the ancestor of the modern Olympics.
Why It's Remarkable
The mechanism's complexity is unmatched by any other known device from the ancient world; nothing of comparable technical sophistication is known to have been built again in Europe for well over a thousand years. Its discovery significantly reshaped historians' understanding of ancient Greek engineering and scientific capability.
What's Still Unknown
Researchers remain uncertain exactly who used the device, whether it served scientists calculating real astronomical data, functioned as a teaching tool for demonstrating how the cosmos worked, or served some combination of both. It is also unknown whether similar devices existed and simply haven't survived or been discovered.
FAQ
How old is the Antikythera Mechanism?
It's estimated to date to around 100 BCE, making it roughly 2,000 years old.
What could the Antikythera Mechanism do?
It tracked the positions of the sun, moon, and known planets, predicted eclipses, and functioned as a calendar.
Has anything like it been found since?
No comparably sophisticated mechanical device from antiquity has been discovered, making it unique among known ancient artifacts.