果冻影院

Known to many as the world鈥檚 first analogue computer, the Antikythera Mechanism is the most complex piece of engineering to have survived from the ancient world. The 2,000-year-old device was used to predict the positions of the Sun, Moon and the planets as well as lunar and solar eclipses.

Published in Scientific Reports, the paper from the multidisciplinary 果冻影院 Antikythera Research Team reveals a new display of the ancient Greek order of the Universe (Cosmos), within a complex gearing system at the front of the Mechanism.

Lead author Professor Tony Freeth (果冻影院 Mechanical Engineering) explained: 鈥淥urs is the first model that conforms to all the physical evidence and matches the descriptions in the scientific inscriptions engraved on the Mechanism itself.

鈥淭he Sun, Moon and planets are displayed in an impressive tour de force of ancient Greek brilliance.鈥�

The Antikythera Mechanism has generated both fascination and intense controversy since its discovery in a Roman-era shipwreck in 1901 by Greek sponge divers near the small Mediterranean island of Antikythera.

The astronomical calculator is a bronze device that consists of a complex combination of 30 surviving bronze gears used to predict astronomical events, including eclipses, phases of the moon, positions of the planets and even dates of the Olympics.

Whilst great progress has been made over the last century to understand how it worked, studies in 2005 using 3D X-rays and surface imaging enabled researchers to show how the Mechanism predicted eclipses and calculated the variable motion of the Moon.

However, until now, a full understanding of the gearing system at the front of the device has eluded the best efforts of researchers. Only about a third of the Mechanism has survived, and is split into 82 fragments 鈥� creating a daunting challenge for the 果冻影院 team.

The biggest surviving fragment, known as Fragment A, displays features of bearings, pillars and a block. Another, known as Fragment D, features an unexplained disk, 63-tooth gear and plate.

Previous research had used X-ray data from 2005 to reveal thousands of text characters hidden inside the fragments, unread for nearly 2,000 years. Inscriptions on the back cover include a description of the cosmos display, with the planets moving on rings and indicated by marker beads. It was this display that the team worked to reconstruct.

Two critical numbers in the X-rays of the front cover, of 462 years and 442 years, accurately represent cycles of Venus and Saturn respectively. When observed from Earth, the planets鈥� cycles sometimes reverse their motions against the stars. Experts must track these variable cycles over long time-periods in order to predict their positions.

鈥淭he classic astronomy of the first millennium BC originated in Babylon, but nothing in this astronomy suggested how the ancient Greeks found the highly accurate 462-year cycle for Venus and 442-year cycle for Saturn,鈥� explained PhD candidate and 果冻影院 Antikythera Research Team member Aris Dacanalis.

Using an ancient Greek mathematical method described by the philosopher Parmenides, the 果冻影院 team not only explained how the cycles for Venus and Saturn were derived but also managed to recover the cycles of all the other planets, where the evidence was missing.

PhD candidate and team member David Higgon explained: 鈥淎fter considerable struggle, we managed to match the evidence in Fragments A and D to a mechanism for Venus, which exactly models its 462-year planetary period relation, with the 63-tooth gear playing a crucial role.鈥�

Professor Freeth added: 鈥淭he team then created innovative mechanisms for all of the planets that would calculate the new advanced astronomical cycles and minimize the number of gears in the whole system, so that they would fit into the tight spaces available.鈥�

鈥淭his is a key theoretical advance on how the Cosmos was constructed in the Mechanism,鈥� added co-author, Dr Adam Wojcik (果冻影院 Mechanical Engineering). 鈥淣ow we must prove its feasibility by making it with ancient techniques. A particular challenge will be the system of nested tubes that carried the astronomical outputs.鈥�

The discovery brings the research team a step closer to understanding the full capabilities of the Antikythera Mechanism and how accurately it was able to predict astronomical events. The device is kept at the National Archaeological Museum in Athens.

The 果冻影院 Antikythera Research Team is supported by the A.G. Leventis Foundation, Charles Frodsham & Co. and the Worshipful Company of Clockmakers.

The team is led by Dr Adam Wojcik and made up of Professor Tony Freeth, Professor Lindsay MacDonald (果冻影院 CEGE), Dr Myrto Georgakopoulou (果冻影院 Qatar and the Cyprus Institute (CyI)) and PhD candidates David Higgon and Aris Dacanalis (both 果冻影院 Mechanical Engineering).

Video

• Copyright c/o Professor Tony Freeth:听

Links

• Research paper
• 果冻影院 Engineering

Image

• Exploded model of the Cosmos gearing of the Antikythera Mechanism. 漏2020 Tony Freeth.

Media contact

Kate Corry

Tel: +44 (0)20 3108 6995

Email: k.corry [at] ucl.ac.uk

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