The World's First Known Computer - Antikythera mechanism Wiki Rewrite #6
The Antikythera mechanism (/ˌæntɪkɪˈθɪərə/ AN-tə-kə-THEER-ə) is a 2000-year-old Greek mechanical model of the solar system. Archeologists believe Greek scientists designed it between 205 BC and 87 BC. It's considered the world's first analog computer.
Archeologist Valerois Stais found the Antikythera mechanism from a 70-60 BC shipwreck off the Antikythera Greek island coast in 1901. The artifact was in a lump in the remains of a wooden box. It has since separated from three to 82 distinct parts.
A 2008 team of Cardiff University scientists used modern x-ray tomography and high-resolution surface scanning to determine more details. They found it was a complex clockwork mechanism composed of at least 30 meshing bronze gears. The gear wheels tracked the Moon and the Sun's movements through the zodiac, predicted eclipses, and even modeled the irregular orbit of the Moon. The 2nd century BC astronomer Hipparchus of Rhodes studied this motion, and scientists speculate he consulted on the machine's construction.
This technology was lost to antiquity. Similar pieces later appeared in the medieval Byzantine and Islamic worlds. Works with similar complexity did not appear again until the development of mechanical astronomical clocks in Europe in the fourteenth century. The National Archaeological Museum in Athens keeps the Antikythera mechanism fragments and many artistic reconstructions and replicas of the mechanism to show how it may have looked and worked.
The Antikythera mechanism (/ˌæntɪkɪˈθɪərə/ AN-tə-kə-THEER-ə) is an ancient Greek hand-powered orrery, described as the first analogue computer, the oldest known example of such a device used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance. It could also be used to track the four-year cycle of athletic games which was similar to an Olympiad, the cycle of the ancient Olympic Games.
This artefact was retrieved from the sea in 1901, and identified on 17 May 1902 as containing a gear by archaeologist Valerios Stais, among wreckage retrieved from a shipwreck off the coast of the Greek island Antikythera. The instrument is believed to have been designed and constructed by Greek scientists and has been variously dated to about 87 BC, or between 150 and 100 BC, or to 205 BC, or to within a generation before the shipwreck, which has been dated to approximately 70–60 BC.
The device, housed in the remains of a 34 cm × 18 cm × 9 cm (13.4 in × 7.1 in × 3.5 in) wooden box, was found as one lump, later separated into three main fragments which are now divided into 82 separate fragments after conservation efforts. Four of these fragments contain gears, while inscriptions are found on many others. The largest gear is approximately 13 centimetres (5.1 in) in diameter and originally had 223 teeth.
It is a complex clockwork mechanism composed of at least 30 meshing bronze gears. In 2008, a team led by Mike Edmunds and Tony Freeth at Cardiff University used modern computer x-ray tomography and high resolution surface scanning to image inside fragments of the crust-encased Mechanism and read the faintest inscriptions that once covered the outer casing of the machine.
Detailed imaging of the mechanism suggests that it had 37 gear wheels enabling it to follow the movements of the Moon and the Sun through the zodiac, to predict eclipses and even to model the irregular orbit of the Moon, where the Moon's velocity is higher in its perigee than in its apogee. This motion was studied in the 2nd century BC by astronomer Hipparchus of Rhodes, and it is speculated that he may have been consulted in the machine's construction.
The knowledge of this technology was lost at some point in antiquity. Similar technological works later appeared in the medieval Byzantine and Islamic worlds, but works with similar complexity did not appear again until the development of mechanical astronomical clocks in Europe in the fourteenth century. All known fragments of the Antikythera mechanism are now kept at the National Archaeological Museum in Athens, along with a number of artistic reconstructions and replicas of the mechanism to demonstrate how it may have looked and worked.