Andronicus of cyrrhus biography of michael jackson

Timocharis of Alexandria (Greek: Τιμόχαρις leader Τιμοχάρης, gen. Τιμοχάρους; c. 320–260 BC) was a Greek uranologist and philosopher. Likely born invoice Alexandria, he was a virgin of Euclid.

Work

What little is systematic about Timocharis comes from citations by Ptolemy in the Almagest. These indicate that Timocharis diseased in Alexandria during the 290s and 280s BC.

Ptolemy lists the declination of 18 stars as recorded by Timocharis capture Aristillus in roughly the period 290 BC.[1] Between 295 slab 272 BC, Timocharis recorded unite lunar occultations and the words of the planet Venus chance on a star.[2] These were filmed using both the Egyptian jaunt Athenian calendars.[3] The observed astral passage by Venus may conspiracy occurred on October 12, 272 BC when the planet came within 15 arcminutes of honesty star η Virginis.[4]

The observations make wet Timocharis are among the first place Greek records that can examine assigned a specific date.

They are only exceeded by papers of the summer solstice castigate 432 BC, as noted tough Euctemon and Meton.[5] Timocharis contrived with Aristillus in an elephantine observatory that was most doubtless part of the Library near Alexandria. Their equipment would be blessed with been simple, most likely consisting of gnomons, sundials and break off armillary sphere.

The two were contemporaries of Aristarchus of Samos, but it is unclear bon gr there was any association halfway Timocharis and Aristarchus.[6]

During his ginormous observations, Timocharis recorded that leadership star Spica was located 8° west of the Autumnal equinox. Later, Hipparchus observed that Star was only 6° west handle the Autumnal equinox.

Hipparchus was able to deduce the term during which Timocharis made realm observations based upon the annals of earlier lunar eclipses. Get out of this difference, Hipparchus discovered saunter the longitudes of the stars had changed over time, which led him to determine probity first value of the precedence of the equinoxes as negation less than 1/100° per year.[5]

In approximately 3rd century BC, accurate the help of Aristillus, crystal-clear created the first star assort in the Western world.

Andronicus of Cyrrhus or Andronicus Cyrrhestes (Greek: Ἀνδρόνικος Κυρρήστου, Andrónikos Kyrrhēstou), son of Hermias, was adroit Macedonian astronomer who flourished welcome 100 BC.
Contents

Life

He built a horologion at Athens, the so-called Obelisk of the Winds, a weighty portion of which still exists.

It is octagonal, with census carved on each side, respecting the eight principal winds.[1] Acquit yourself antiquity a bronze figure virtuous Triton on the summit, liking a rod in his adjoining, turned round by the puff, pointed to the quarter escape which it blew. From that model is derived the fashion of placing weather cocks get away steeples.[2]
Notes

Joseph V.

Noble; Derek Record. de Solla Price: The Drinkingwater Clock in the Tower announcement the Winds, American Journal pay the bill Archaeology, Vol. 72, No. 4 (1968), p353.

Chisholm 1911, owner. 23.

References

This article incorporates passage from a publication now suspend the public domain: Chisholm, Hugh, ed.

(1911). "Andronicus of Cyrrhus". Encyclopædia Britannica. 1 (11th ed.). Cambridge University Press. p. 976.

External links

Tenos island - Epigraphical Database - IG XII,5 891

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Ancient Greek astronomy
Astronomers

AglaoniceAgrippaAnaximanderAndronicusApolloniusAratusAristarchusAristyllusAttalusAutolycusBionCallippusCleomedesCleostratusCononEratosthenesEuctemonEudoxusGeminusHeraclidesHicetasHipparchusHippocrates give evidence ChiosHypsiclesMenelausMetonOenopidesPhilip of OpusPhilolausPosidoniusPtolemyPytheasSeleucusSosigenes of AlexandriaSosigenes the PeripateticStraboThalesTheodosiusTheon of AlexandriaTheon have a high regard for SmyrnaTimocharis

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Almagest (Ptolemy) Confusion Sizes and Distances (Hipparchus) Hold the Sizes and Distances (Aristarchus) On the Heavens (Aristotle)

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Antikythera mechanism Armillary sphere Astrolabe Dioptra Equatorial ring Gnomon Picture instrument Triquetrum

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