1. Oenopides Very little is known about the life of oenopides of chios except that his place of birth was the island of Chios. We believe that Oenopides was in Athens http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Oenopides.html

Oenopides of Chios Born: about 490 BC in Chios (now Khios), Greece Died: about 420 BC Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Version for printing Very little is known about the life of Oenopides of Chios except that his place of birth was the island of Chios. We believe that Oenopides was in Athens when a young man but there is only circumstantial evidence for this. In Plato 's Erastae Oenopides is described as (see for example [1]):- ... having acquired a reputation for mathematics... and Plato also describes a scene where Socrates comes across two young men in the school of Dionysius who was Plato 's teacher. The young men were discussing a question in mathematical astronomy which had been tackled by Oenopides and Anaxagoras . This question was certainly that of the angle that the ecliptic makes with the celestial equator . Bulmer-Thomas writes in [1]:- ... it was probably Oenopides who settled on the value of , which was accepted in Greece until refined by Eratosthenes . Indeed, if Oenopides did not fix on this or some other figure it is difficult to know in what his achievement consisted, for the Babylonians no less than the Pythagoreans and Egyptians must have realised from early days that the apparent path of the sun was inclined to the celestial equator.

2. TMTh OENOPIDES OF CHIOS MATHEMATICIAN, ASTRONOMER oenopides of chios (fl. 5th century BC) http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

3. O Index oenopides of chios (818) Ohm, Georg Simon (1910*) Oka, Kiyoshi (485*) Oleinik, Olga (880*) Olivier, Théodore (665), Omar Khayyam (2140*) http://www-groups.dcs.st-and.ac.uk/~history/Indexes/O.html

Names beginning with O The number of words in the biography is given in brackets. A * indicates that there is a portrait. Ockham , William of (1503*) Oenopides of Chios (818) Ohm , Georg Simon (1910*) Oka , Kiyoshi (485*) Oleinik , Olga (880*) Olivier Omar Khayyam Ore , Oystein (1604*) Oresme , Nicole d' (191*) Orlicz , Wladyslaw (1933*) Ortega , Juan de (157) Osgood , William (1426*) Osipovsky , Timofei (187) Ostrogradski , Mikhail (528*) Ostrowski , Alexander (1419*) Oughtred , William (654*) Ovidio , Enrico D' (414) Ozanam , Jacques (1604) Alphabetical indexes A B C D ... XYZ Chronological indexes - 500 AD 1940-present Main index Biographies Index ... Search suggestions JOC/EFR August 2005 The URL of this page is: School of Mathematics and Statistics University of St Andrews, Scotland http://www-history.mcs.st-andrews.ac.uk/Indexes/@.html

4. Oenopides oenopides of chios http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

5. Oenopides Of Chios (b. Ca. 480 BC) -- From Eric Weisstein's World Of Scientific oenopides of chios (b. ca. 480 BC). Greek natural philosopher who determined the inclination of the ecliptic to be 24° (actually 23.5°). http://scienceworld.wolfram.com/biography/Oenopides.html

Branch of Science Astronomers Branch of Science Philosophers ... Greek Oenopides of Chios (b. ca. 480 BC) year to have 365 1/5 days (actually 365.2422). Additional biographies: Greek and Roman Science and Technology

6. Chios - Egoldlife.com Projects Chios. Oenopides. Very little is known about the life of oenopides of chios except that his place of birth was the island of Chios. We http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

7. History Of Mathematics Greece Antiphon of Rhamnos (the Sophist) (c. 480411) oenopides of chios (c. 450?) Leucippus (c. 450) Hippocrates of Chios (c. 450) http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

8. History Of Mathematics Chronology Of Mathematicians Antiphon of Rhamnos (the Sophist) (c. 480411) *SB *MT oenopides of chios (c. 450?) *SB Leucippus (c. 450) *SB *MT http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

9. Oenopides oenopides of chios. Version for printing. Very little is known about the life of oenopides of chios except that his place of birth was the island of Chios. http://www-groups.dcs.st-andrews.ac.uk/history/Mathematicians/Oenopides.html

Oenopides of Chios Born: about 490 BC in Chios (now Khios), Greece Died: about 420 BC Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Version for printing Very little is known about the life of Oenopides of Chios except that his place of birth was the island of Chios. We believe that Oenopides was in Athens when a young man but there is only circumstantial evidence for this. In Plato 's Erastae Oenopides is described as (see for example [1]):- ... having acquired a reputation for mathematics... and Plato also describes a scene where Socrates comes across two young men in the school of Dionysius who was Plato 's teacher. The young men were discussing a question in mathematical astronomy which had been tackled by Oenopides and Anaxagoras . This question was certainly that of the angle that the ecliptic makes with the celestial equator . Bulmer-Thomas writes in [1]:- ... it was probably Oenopides who settled on the value of , which was accepted in Greece until refined by Eratosthenes . Indeed, if Oenopides did not fix on this or some other figure it is difficult to know in what his achievement consisted, for the Babylonians no less than the Pythagoreans and Egyptians must have realised from early days that the apparent path of the sun was inclined to the celestial equator.

10. Science Timeline oenopides of chios probably created the first three of what became Euclid's 'postulates' or assumptions. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

11. Greek Mathematics Index Heron Hipparchus Hippias Hippocrates, Hypatia Hypsicles Leucippus Marinus of Neapolis Menaechmus Menelaus Nicomachus Nicomedes oenopides of chios Pappus Perseus http://www-groups.dcs.st-andrews.ac.uk/history/Indexes/Greeks.html

History Topics: Index of Ancient Greek mathematics Articles about Greek mathematics. Squaring the circle Doubling the cube Trisecting an angle Greek Astronomy ... The teaching of mathematics in Ancient Greece. Various lists of Greek mathematicians. Full list Mathematicans/Philosophers Mathematicians/Astronomers Mathematicians/Astronomers/Philosophers ... Later circle squarers Click on a name below to go to that biography. Full List of Greek Mathematicians in our archive Anaxagoras Anthemius Antiphon Apollonius ... Zenodorus Greek Mathematicans/Philosophers Anaxagoras Antiphon Archytas Aristotle ... Zeno of Elea Greek Mathematicians/Astronomers Apollonius Archimedes Aristarchus Aristotle ... Theon of Smyrna Greek Mathematicians/Astronomers/Philosophers Aristotle Cleomedes Democritus Eudoxus ... Thales Greek Circle squarers Anaxagoras Antiphon Apollonius Archimedes ... Bryson Carpus Dinostratus Hippias Hippocrates Nicomedes ... Sporus Later Circle squarers Al-Haytham Johann Bernoulli Cusa James Gregory ... Search Form JOC/EFR January 2004 The URL of this page is: http://www-history.mcs.st-andrews.ac.uk/Indexes/Greeks.html

12. Full Alphabetical Index Ockham, William of (140*) oenopides of chios (818) Ohm, Georg Simon (1910*) Oka, Kiyoshi (485*) Olivier, Th odore (74) Omar Khayyam (2140 http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

13. Encyclopedia Of Astronomy And Astrophysics » Oenopides Of Chios (c. 500–c. oenopides of chios (c. 500–c. 430 BC). DOI 10.1888/0333750888/3898; Published November 2000. Icon Full text (PDF, 19K) http://eaa.iop.org/index.cfm?action=summary&doc=eaa/3898@eaa-xml

14. Pythagoras And The Pythagoreans It is said that Pythagoras was the first to recognise the slant of the zodiacal circle which oenopides of chios appropriated as his own Page http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

15. Encyclopedia Of Astronomy And Astrophysics » Browse By Title Records 1 to 1 of 1 in O » OE. Article oenopides of chios (c. 500–c. 430 BC); Published November 2000; Summary Greek natural philosopher credited by http://eaa.iop.org/index.cfm?action=browse.home&type=ti&dir=O/OE

16. Astronomia Autodidacta Hiparco de Rodas Mohammed Ulugh Beg Nicol s de Cusa Oenopides de Chios Pit goras Regiomontanus Tales de Mileto http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

17. Ancient Greek Science And Technology Hypsicles , Leucippus , Marinus of Neapolis , Menaechmus , Menelaus , Nicomachus , Nicomedes , oenopides of chios , Pappus , Perseus http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126

18. Oenopides: Information From Answers.com Oenopides (crater) General characteristics Latitude 57.0° N Longitude 64.1° W Diameter 67 km Depth Eponym, oenopides of chios. References, See listing http://www.answers.com/topic/oenopides

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping Oenopides Wikipedia Oenopides (crater) General characteristics Latitude 57.0° N Longitude 64.1° W Diameter 67 km Depth Unknown Colongitude 66° at sunrise Eponym Oenopides of Chios References See listing Oenopides is a lunar crater that is located near the northwest limb of the Moon , and so appears foreshortened when viewed from the Earth . This formation lies due south of the prominent Pythagoras crater , and is attached to the southwest rim of 'Babbage E'. The southwest rim of Oenopides is part of the northern edge of Oceanus Procellarum . To the south is the Markov crater This formation is an old crater that has been heavily eroded by subsequent impacts, leaving a low outer rim that is generally hilly and contains a few clefts. There is a gap in the southeast rim, and the level interior is attached to the lunar mare to the south. There are several small craters lying near the eastern rim, and the remainder of the floor is marked by tiny craterlets. To the southwest is the remnant of 'Oenopides R', of which only parts of the rim are still protruding above the surface and the southern rim is completely missing.

19. List Of Craters On The Moon, O-S: Information From Answers.com Oenopides, 67 km, oenopides of chios. Oersted, 42 km, Hans Christian Ørsted Ohm, 64 km, Georg Simon Ohm Oken, 71 km, Lorenz Oken http://www.answers.com/topic/list-of-craters-on-the-moon-o-s

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping List of craters on the Moon, O-S Wikipedia List of craters on the Moon, O-S This is a subset of the list of craters on the Moon . Where a crater formation has associated satellite craters, these are detailed on the main crater description pages. Craters on the Moon A-B C-F G-K L-N O-S T-Z O Crater Diameter Eponym Oberth 60 km Hermann Oberth Obruchev 71 km Vladimir Afanasyevich Obruchev O'Day 71 km Marcus O'Day Oenopides 67 km Oenopides of Chios Oersted 42 km Hans Christian ˜rsted Ohm 64 km Georg Simon Ohm Oken 71 km Lorenz Oken Olbers 74 km Heinrich Wilhelm Matth¤us Olbers Olcott 81 km William Tyler Olcott Olivier 69 km Charles Pollard Olivier Omar Khayyam 70 km Omar Khayyam Onizuka 29 km Ellison Onizuka Opelt 48 km Friedrich Wilhelm Opelt Oppenheimer 208 km J. Robert Oppenheimer Oppolzer 40 km Theodor von Oppolzen Oresme 76 km Nicolaus von Oresme Orlov 81 km Aleksandr Iakovlevich Orlov Sergei Vladimirovich Orlov Orontius 105 km Oronce Fin© Osama 0.5 km

20. PSIgate - Physical Sciences Information Gateway Search/Browse Results oenopides of chios This site provides a short biography of the early mathematical astronomer Oenopides (approx 490420BC). The site is part of the MacTutor http://www.psigate.ac.uk/roads/cgi-bin/psibrowse.pl?limit=0&toplevel=policy&subj

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