Hipparchus | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-03-26

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Hipparchus


00:02:04 1 Life and work
00:06:19 1.1 Modern speculation
00:08:18 2 Babylonian sources
00:11:40 3 Geometry, trigonometry, and other mathematical techniques
00:12:12 4 Lunar and solar theory
00:12:57 4.1 Motion of the Moon
00:14:09 4.2 Orbit of the Moon
00:21:09 4.3 Apparent motion of the Sun
00:21:20 4.4 Orbit of the Sun
00:25:47 4.5 Distance, parallax, size of the Moon and the Sun
00:30:39 4.6 Eclipses
00:38:12 5 Astronomical instruments and astrometry
00:39:17 6 Star catalog
00:40:16 6.1 Stellar magnitude
00:40:42 7 Precession of the equinoxes (146–127&#160;spanspanBC
00:41:27 8 Geography
00:44:04 9 Legacy
00:53:24 10 Monument
00:56:53 11 Editions and translations
01:01:22 12 References
01:06:25 12.1 Works cited
01:07:23 13 Further reading
01:08:52 14 External links
01:11:51 Legacy
01:12:29 Monument
01:12:56 Editions and translations



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SUMMARY
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Hipparchus of Nicaea (; Greek: Ἵππαρχος, Hipparkhos; c. 190 – c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.Hipparchus was born in Nicaea, Bithynia (now İznik, Turkey), and probably died on the island of Rhodes, Greece. He is known to have been a working astronomer at least from 162 to 127 BC. Hipparchus is considered the greatest ancient astronomical observer and, by some, the greatest overall astronomer of antiquity. He was the first whose quantitative and accurate models for the motion of the Sun and Moon survive. For this he certainly made use of the observations and perhaps the mathematical techniques accumulated over centuries by the Babylonians and by Meton of Athens (5th century BC), Timocharis, Aristyllus, Aristarchus of Samos and Eratosthenes, among others. He developed trigonometry and constructed trigonometric tables, and he solved several problems of spherical trigonometry. With his solar and lunar theories and his trigonometry, he may have been the first to develop a reliable method to predict solar eclipses. His other reputed achievements include the discovery and measurement of Earth's precession, the compilation of the first comprehensive star catalog of the western world, and possibly the invention of the astrolabe, also of the armillary sphere, which he used during the creation of much of the star catalogue.