Antikythera Mechanism
A 2,000-year-old Greek analog computer discovered in a shipwreck, capable of calculating astronomical positions, eclipses, and the Olympic Games cycle.
OVERVIEW
The Antikythera Mechanism is an ancient Greek analog computer discovered in 1901 in a shipwreck off the island of Antikythera, Greece. Dating to approximately 100 BCE, the device consists of a complex system of bronze gears that calculated the positions of the sun, moon, and planets, predicted eclipses, and tracked the cycle of the Olympic Games. Modern X-ray and CT scanning (2005–2021) has revealed the mechanism's extraordinary sophistication, including a gear train that models the irregular orbit of the moon using the epicyclic theory of Hipparchus. No other device of comparable complexity is known from antiquity. The technology was not matched until the 14th-century astronomical clocks of Europe.
KNOWN FACTS
X-ray and CT scans have revealed 30+ bronze gears with triangular teeth
The mechanism's front face shows the zodiac and calendar dials
The back face has spiral dials for eclipse prediction (Saros cycle) and Olympic Games
The gear ratios accurately model the Metonic, Saros, and Callippic astronomical cycles
The mechanism's sophistication is comparable to 18th-century European clocks
CLAIMS
The mechanism demonstrates technological capabilities thought impossible for ancient Greeks
The technology was lost and not rediscovered for over 1,000 years
The mechanism may be evidence of a lost tradition of advanced Greek engineering
The device's complexity suggests it was not unique; others may have existed
The mechanism's knowledge was suppressed or lost with the destruction of the Library of Alexandria
EVIDENCE FOR
X-ray and CT scans have revealed 30+ bronze gears with triangular teeth
The mechanism's front face shows the zodiac and calendar dials
The back face has spiral dials for eclipse prediction (Saros cycle) and Olympic Games
The gear ratios accurately model the Metonic, Saros, and Callippic astronomical cycles
The mechanism's sophistication is comparable to 18th-century European clocks
EVIDENCE AGAINST
The mechanism is not evidence of lost technology; it's evidence of known Greek engineering
Ancient texts (Cicero, Archimedes) describe similar devices, confirming they existed
The technology was not 'lost' but was not economically practical for mass production
The mechanism's complexity is impressive but consistent with Greek mechanical knowledge
The Library of Alexandria destruction narrative is overblown; the mechanism predates it
OPEN QUESTIONS
No open questions recorded.
SOURCES
TIMELINE
Mechanism constructed (estimated date)
Shipwreck off Antikythera
Mechanism discovered by sponge divers
Price begins systematic study
Modern CT scanning reveals full complexity