Although a contemporary of Hipparchus', Seleucus of Seleucia, remained a proponent of the heliocentric model, Hipparchus' rejection of heliocentrism was supported by ideas from Aristotle and remained dominant for nearly 2000 years until Copernican heliocentrism turned the tide of the debate. Hipparchus was amongst the first to calculate a heliocentric system, but he abandoned his work because the calculations showed the orbits were not perfectly circular as believed to be mandatory by the science of the time. Most of what is known about Hipparchus comes from Strabo's Geography and Pliny's Natural History in the first century Ptolemy's second-century Almagest and additional references to him in the fourth century by Pappus and Theon of Alexandria in their commentaries on the Almagest. Although he wrote at least fourteen books, only his commentary on the popular astronomical poem by Aratus was preserved by later copyists. Relatively little of Hipparchus's direct work survives into modern times. In the second and third centuries, coins were made in his honour in Bithynia that bear his name and show him with a globe. He is believed to have died on the island of Rhodes, where he seems to have spent most of his later life. Hipparchus obtained information from Alexandria as well as Babylon, but it is not known when or if he visited these places. Hipparchus must have lived some time after 127 BC because he analyzed and published his observations from that year.
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190 BC) was calculated by Delambre based on clues in his work. The exact dates of his life are not known, but Ptolemy attributes astronomical observations to him in the period from 147 to 127 BC, and some of these are stated as made in Rhodes earlier observations since 162 BC might also have been made by him. Hipparchus was born in Nicaea (Greek Νίκαια), in Bithynia. 7 Precession of the equinoxes (146–127 BC).6.4 Arguments for and against Hipparchus' star catalog in the Almagest.
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5 Astronomical instruments and astrometry.4.5 Distance, parallax, size of the Moon and the Sun.3 Geometry, trigonometry and other mathematical techniques.Sometimes Hipparchus is referred to as the "father of astronomy", a title first conferred on him by Jean Baptiste Joseph Delambre. 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 that he used during the creation of much of the star catalogue. With his solar and lunar theories and his trigonometry, he may have been the first to develop a reliable method to predict solar eclipses. He developed trigonometry and constructed trigonometric tables, and he solved several problems of spherical trigonometry. 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 (fifth century BC), Timocharis, Aristyllus, Aristarchus of Samos, and Eratosthenes, among others. He was the first whose quantitative and accurate models for the motion of the Sun and Moon survive. Hipparchus is considered the greatest ancient astronomical observer and, by some, the greatest overall astronomer of antiquity. He is known to have been a working astronomer between 162 and 127 BC.
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Hipparchus was born in Nicaea, Bithynia, and probably died on the island of Rhodes, Greece. He is considered the founder of trigonometry, but is most famous for his incidental discovery of precession of the equinoxes. 120 BC) was a Greek astronomer, geographer, and mathematician. Once you’ve completed the assembly and setup process, you can connect your weather station via Wi-Fi® to the Weather Underground or Weathercloud data servers, which enables you to view the weather conditions in your backyard from anywhere with an internet connection, or monitor the data from the last week, month, or year.Hipparchus of Nicaea ( / h ɪ ˈ p ɑːr k ə s/ Greek: Ἵππαρχος, Hipparkhos c. The weather display monitors current weather and environmental conditions, can predict weather conditions for the next 12~24 hours, or alert you to a variety of severe or important weather events, like when the temperature outside goes too high/too low, or if the barometric pressure experiences a significant rise or fall. View all your current weather data at a glance on a stunning color LCD display that can sit comfortably on a shelf or be wall-mounted at your convenience. The Logia™ Wireless Weather Station provides you with customized weather readings directly from the comfort of your back yard. 5-in-1 Wireless Weather Station with Wi-Fi® (LOWSC510WB)Ĭonnect with your inner meteorologist with this handy at-home weather station.