I am shocked!
The Antikethyra mechanism was made for entertainment or circus?
The
Antikythera mechanism (pronounced [ame="http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English"]/ˌæntɨkɨˈθɪərə/[/ame] [ame="http://en.wikipedia.org/wiki/Wikipedia

ronunciation_respelling_key"]
ANT-i-ki-THEER-ə[/ame] or pronounced [ame="http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English"]/ˌæntɨˈkɪθərə/[/ame] [ame="http://en.wikipedia.org/wiki/Wikipedia

ronunciation_respelling_key"]
ANT-i-KITH-ə-rə[/ame]) is an ancient [ame="http://en.wikipedia.org/wiki/Analog_computer"]mechanical computer[/ame]
[1][2] designed to calculate [ame="http://en.wikipedia.org/wiki/Astronomy"]astronomical[/ame] positions. It was recovered in 1900–01 from the [ame="http://en.wikipedia.org/wiki/Antikythera_wreck"]Antikythera wreck[/ame].
[3] Its significance and complexity were not understood until decades later. Its time of construction is now estimated between 150 and 100 [ame="http://en.wikipedia.org/wiki/BCE"]BCE[/ame].
[4] The degree of mechanical sophistication is comparable to a 19th century Swiss clock.
[5] Technological artifacts of similar complexity and workmanship did not reappear until the 14th century, when mechanical [ame="http://en.wikipedia.org/wiki/Astronomical_clock"]astronomical clocks[/ame] were built in Europe.
[6]
Jacques-Yves Cousteau visited the wreck for the last time in 1978,
[7] but found no additional remains of the Antikythera mechanism. Professor Michael Edmunds of [ame="http://en.wikipedia.org/wiki/Cardiff_University"]Cardiff University[/ame] who led the most recent study of the mechanism said: "This device is just extraordinary, the only thing of its kind. The design is beautiful, the astronomy is exactly right. The way the mechanics are designed just makes your jaw drop. Whoever has done this has done it extremely carefully ... in terms of historic and scarcity value, I have to regard this mechanism as being more valuable than the [ame="http://en.wikipedia.org/wiki/Mona_Lisa"]Mona Lisa[/ame]."
[8][9]
The device is remarkable for the level of miniaturization and for the complexity of its parts, which is comparable to that of 19th century clocks. It has over 30 gears, although Michael Wright (see below) has suggested as many as 72 gears, with teeth formed through [ame="http://en.wikipedia.org/wiki/Equilateral_triangle"]equilateral triangles[/ame]. When a date was entered via a crank (now lost), the mechanism calculated the position of the [ame="http://en.wikipedia.org/wiki/Sun"]Sun[/ame], [ame="http://en.wikipedia.org/wiki/Moon"]Moon[/ame], or other astronomical information such as the location of other planets. Since the purpose was to position astronomical bodies with respect to the [ame="http://en.wikipedia.org/wiki/Celestial_sphere"]celestial sphere[/ame], with reference to the observer's position on the surface of the Earth, the device was based on the [ame="http://en.wikipedia.org/wiki/Geocentric_model"]geocentric model[/ame].
On 30 November 2006, the science journal
Nature published a new reconstruction of the mechanism by the Antikythera Mechanism Research Project, based on the high resolution X-ray tomography described above.
[51] This work doubled the amount of readable text, corrected prior transcriptions, and provided a new translation. The inscriptions led to a dating of the mechanism to around 100 [ame="http://en.wikipedia.org/wiki/BCE"]BCE[/ame]. It is evident that they contain a manual with an astronomical, mechanical and geographical section. The name [ame="http://en.wikipedia.org/wiki/Hispania"]HISPANIA[/ame] (ΙΣΠΑΝΙΑ, Spain in Greek) in these texts is the oldest reference to the Iberian Peninsula under this form, as opposed to [ame="http://en.wikipedia.org/wiki/Iberian_Peninsula"]Iberia[/ame].
The new discoveries confirm that the mechanism is an astronomical analog calculator or [ame="http://en.wikipedia.org/wiki/Orrery"]orrery[/ame] used to predict the positions of celestial bodies. This work proposes that the mechanism possessed 37 gears, of which 30 survive, and was used for prediction of the position of the Sun and the Moon. Based on the inscriptions, which mention the [ame="http://en.wikipedia.org/wiki/Stationary_points"]stationary points[/ame] of the planets, the authors speculate that planetary motions may also have been indicated.
On the front face were graduations for the solar scale and the [ame="http://en.wikipedia.org/wiki/Zodiac"]zodiac[/ame] together with pointers that indicated the position of the Sun, the [ame="http://en.wikipedia.org/wiki/Moon"]Moon[/ame], the lunar phase, and possibly the planetary motions.
On the back, two spiral scales (made of half-circles with two centers) with sliding pointers indicated the state of two further important astronomical cycles: the [ame="http://en.wikipedia.org/wiki/Saros_cycle"]Saros cycle[/ame], the period of approximately 18 years separating the return of the Sun, Moon and Earth to the same relative positions and the more accurate [ame="http://en.wikipedia.org/wiki/Exeligmos"]exeligmos[/ame] cycle of 54 years and one day (essential in eclipse prediction, see [ame="http://en.wikipedia.org/wiki/Eclipse_cycle"]Eclipse cycle[/ame]). It also contains another spiral scale for the [ame="http://en.wikipedia.org/wiki/Metonic_cycle"]Metonic cycle[/ame] (19 years, equal to 235 lunar months) and the [ame="http://en.wikipedia.org/wiki/Callippic_cycle"]Callippic cycle[/ame] with a period of 1016 lunar orbits in approximately 76 years.
The Moon mechanism, using an ingenious [ame="http://en.wikipedia.org/wiki/Gear_train"]train of gears[/ame], two of them linked with a slightly offset axis and pin in a slot, shows the position and phase of the Moon during the month. The velocity of the Moon varies according to the theory of Hipparchus, and to a good approximation follows
Kepler's second law for the angular velocity, being faster near the perigee and slower at the apogee.
On 31 July 2008, a paper providing further details about the mechanism was published in
Nature (
Nature Vol 454, Issue 7204, July 31, 2008).
[52] In this paper, among other revelations, it is demonstrated that the mechanism also contained a dial divided into four parts, and demonstrated a four-year cycle through four segments of one year each, which is thought to be a means of describing which of the games (such as the ancient Olympics) that took place in two and four-year cycles were to take place in any given year.
[ame=http://en.wikipedia.org/wiki/Antikythera_mechanism]Antikythera mechanism - Wikipedia, the free encyclopedia[/ame]