by Himitsu Bako
from
HumitsuBako Website
Nonsense and pseudo science run rampant in our world. Claims of
conspiracy and extra natural phenomenology replace the proper use of
rational inquiry to examine the unknown. Often, the creation of a
pseudo science mythology is easier and more profitable than
performing the needed research to discover a historical or physical
fact.
The
Antikythera Mechanism, one mystery of the ancient world.
Immediately before Easter 1900, sponge divers exploring off
the coast of Antikythera island in the Aegean Sea discovered
the wreckage of an ancient Greek ship. The ship, determined sunk in
65 B.C.±15 years, rested in 42 meters of water at latitude 35° 52’
30’’ north, longitude 23° 18’ 35’’ east.1
Not the first discovered Greek wreck, not the last. For some months
after the discovery, salvage divers worked to recover statues and
other artifacts from the wreckage. None of the recovered items
seemed extraordinary till 17 May 1902 when archaeologist Spyridon
Stais noticed a gear mechanism in one artifact.2
The artifact remained something of an oddity until 1951 when
British physicist Derek Price began an analysis of the
mechanism. In a seminal 1959 paper published in Scientific America,
he reported the mechanism was a component of a device to calculate
the motion of stars and planets.3 As
science historian James Burke often states, then the world
changed. The change was not of the high publicity, earth-shattering
type, rather the facts of the mechanism forced historians to
reevaluate the technological sophistication of the Greek culture of
the first century B.C. (An old joke states that if you earn a Ph.D
you lose the ability to say "I don’t understand," and "I was
wrong.") In 1971, the Greek Atomic Energy Commission performed gamma
radiographic scans of the mechanism which allowed Price to
deduce the function of the device.4
The mechanism was a component of an analog astronomical computer
that displayed the position of the sun and moon on any particular
day of the year. Why is such a device so extraordinary? The device
operated via the use differential gearing, a technology thought
developed in the 13th century A.D. Why use differential
gearing? The device displayed the moon phase based on the synodic
month; the period between two new moons - 29 days 12 hours 44
minutes (29.530556 days). The sidereal month is the period of the
moon’s 360 degree orbit of the earth - 27 days 7 hours 43 minutes
(27.321578 days). A moon phase is a function of the relative
position of the sun, moon, and earth, and since the earth revolves
around the sun as the moon revolves around the earth, the relative
sun-earth-moon configuration requires the extra 2.21 days to repeat
a moon phase. A simulation of the phase must subtract the sidereal
motion of the sun from the motion of the moon. Hence, use a
differential.
One might wonder why the device is considered a mystery if its
function is understood. Easily answered, the mechanism is the
only known artifact of that type. Was the mechanism a
one-of-a-kind device? Almost definitely not. What sort of similar
mechanisms existed in the ancient world?
Science cause situations like this, one answer causes new questions.
The most persistent mystery, who designed and built the amazing
mechanism? Perhaps Posidonius (135 BC to c. 50 BC) a Rhodian
historian who also studied the motion of the sun and moon.
"In the history of ancient thought
he can be compared to no one but Aristotle."
Greek (Rhodian) historian, scientist,
philosopher. He wrote a 52-book history of the Roman Empire,
picking up where Polybius left off. This work heavily
influenced later historians and other writers, from which we glean
what we know of Posidonius and his views. He promoted the
Roman Empire, seeing it as a reflection of the cosmic order, in
which every human is a citizen of the great city of God.
Posidonius saw that primitive cultures were equivalent to the
earlier stages of advanced cultures and thus saw the commonality of
mankind, which he believed would be best fostered by unification
under Rome.
Posidonius was also a theoretical
and experimental scientist, studying tides and their relationship
with the moon, calculating the circumference of the earth, and
recording ocean currents. His interest in the sciences was in part
due to his belief that similar laws apply in both the worlds of man
and of nature. He believed that in studying the one, you could learn
also about the other, and through better appreciation of common
laws, better understand the overarching structure of philosophical
existence and the cosmos itself. A powerful thinker, Posidonius
greatly impressed his contemporaries and left a significant legacy
in their thought and writing, the famous biographer Plutarch
being among those "dependent on Posidonius for their conception of
history."
As noted by Arthur C. Clarke, though the mechanism predicts
the motion of the bodies, it does not explain the motion.5
To know the what, does not imply you understand the why.
A list of serving information on the Antikythera Mechanism:
-
Gears from the Greeks. A
presentation by E. Christopher Zeeman, K.B., F.R.S, at the
University of Texas at San Antonio, February 20, 1998. An
excellent presentation on the history and reality of the
mechanism. Warning, Zeeman’s penmanship is almost as bad as
mine.
-
The Antikythera Mechanism: Physical and
Intellectual Salvage from the 1st Century B.C. by
Robert S. Rice in the USNA Eleventh Naval History Symposium. A
well researched and technical examination of the device.
-
Antikythera mechanism links by
Australian Rupert Russell.
-
Bernard Gardener’s 1993 Honors
Thesis, 3D Analysis of X-rays of the Antikythera Mechanism.
-
The American Mathematical Society’s
"What’s New in Math" includes two columns by Tony Phillips, SUNY
at Stony Brook, on the mechanism’s function. The first a general
description of the sun-moon assembly, the second an examination
of the differential gear.
-
John Gleave, an orrery maker,
constructed a
functional version of the mechanism.
As of March 2001, the cost for a reproduction was approximately
$4000.00.
We need neither ancient astronauts or
advanced lost civilizations to explain the existence of the
mechanism. Man’s ingenuity provides all the explanation
needed.
[1] Russell, Rupert,
Third Year B. Comp Assignment, April 1996. Tutor, Peter
Colville.
[2] Welfare, S., Aruthur C. Clarke’s Mysterious
World, pg. 65.
[3] Price, Derek J. de Solla, "An Ancient Greek
Computer," Scientific American Vol. 200 No. 6 (June, 1959):
60-67.
[4] Price, Derek J. de Solla, Gears from the Greeks,
1975.
[5] Clarke, Authur C., "Technology and the Limits of
Knowledge," in The View from Serendip.
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