the antikythera mechanism - amazon s3 · the antikythera mechanism how was it discovered? what did...
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The Antikythera
mechanismHow was it discovered?
What did it calculate?
Where did the technology come
from?
And where did it go?
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“If it is genuine, the Antikythera
machine must entail a complete re-
estimation of ancient Greek
technology. Its discovery 55 years
ago…was as spectacular as if the
opening of Tutankhamun’s tomb had
revealed the decayed but
recognisable parts of an internal
combustion engine.”
Derek de Solla Price, 1957
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So what did it
calculate?
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Vega rises in the evening
The Hyades set in the
morning
Gemini begins to rise
… two pointers, whose ends carry …
… the Sun’s rays … ecliptic …
… the spiral divided into 235 sections
…
…Venus…Mercury…
… stationary points …
… golden little sphere … little sphere
…
…trunnions … gnomon … perforations
…
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What about the
maths?
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48 = 3
16 = 1
16
48 3
48 x 48 = 9
16 16
48 x 48 x 48 = 27
16 16 16
Turning gears into maths
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The Metonic cycle
235 synodic months =
254 sidereal months = 19
years
Antikythera gear
train64 x 48 x 127 = 254
38 24 32 19
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SAROS CYCLE
223 synodic months = 18 years 11
1/3 days
Eclipses repeat after this time, but
shifted by 8 hrs and 1/3 of way
around world
So the Greeks used the Exeligmos
cycle, which is 3 x Saros = 54 years
34 days
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Where did the
technology come
from?
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Cicero (1st century BC)
• “[An instrument] recently constructed by our friend Posidonius, which at each revolution reproduces the same motions of the Sun, the Moon and the five planets that take place in the heavens each day and night.”
• “The invention of Archimedes deserved special admiration because he had thought out a way to represent accurately by a single device for turning the globe those various and divergent movements with their different rates of speed.”
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Local month names
ΦΟΙΝΙΚΑΙΟ ΑΡΣΕΜΙΙΟ
ΚΡΑΝΕΙΟ ΦΤ∆ΡΕΤ
ΛΑΝΟΣΡΟΠΙΟ ΓΑΜΕΙΛΙΟ
ΜΑΥΑΝΕΤ ΑΓΡΙΑΝΙΟ
∆Ω∆ΕΚΑΣΕΤ ΠΑΝΑΜΟ
ΕΤΚΛΕΙΟ ΑΠΕΛΛΑΙΟ
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4-year Olympiad Dial
Isthmia
Olympia
Nemea
Pythia
Naa
??
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Where did the technology
go?
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Web
linkswww.decodingtheheavens.com
www.antikythera-mechanism.gr
www.hpl.hp.com/research/ptm/antikythera_mechanism/
www.mogi-vice.com/transiti/A-t-1280.avi
www.shawinspectionsystems.com/library/antikythera/dr/
dr.htm
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