Rocha, Indiana University, United States of America It was not entirely accurate, but it was an astonishing achievement for its era.Ĭitation: Freeth T (2014) Eclipse Prediction on the Ancient Greek Astronomical Calculating Machine Known as the Antikythera Mechanism. The ancient Greeks built a machine that can predict, for many years ahead, not only eclipses but also a remarkable array of their characteristics, such as directions of obscuration, magnitude, colour, angular diameter of the Moon, relationship with the Moon’s node and eclipse time. Together, these models imply a surprisingly early epoch for the Antikythera Mechanism. The second model closely matches the glyph times and explains the four-turn spiral of the Saros Dial. It also implies the existence of lost lunar eclipse inscriptions. The first model solves the glyph distribution, the grouping and anomalous ordering of the index letters and the structure of the inscriptions.
Based on these new readings, two arithmetical models are presented here that explain the complete eclipse prediction scheme. A new reading and interpretation of data from the back plate of the Antikythera Mechanism, including the glyphs, the index letters and the eclipse inscriptions, has resulted in substantial changes to previously published work. The grouping and ordering of the index letters, the organization of the inscriptions and the eclipse times have previously been unsolved. These include Index Letter Groups, describing shared eclipse characteristics. Eclipses are indicated on a four-turn spiral Saros Dial by glyphs, which describe type and time of eclipse and include alphabetical index letters, referring to solar eclipse inscriptions. The ancient Greek astronomical calculating machine, known as the Antikythera Mechanism, predicted eclipses, based on the 223-lunar month Saros cycle.
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