afwiki Hipparchos; arwiki أبرخش; arzwiki هيبارخوس; astwiki Hiparco de Nicea; azwiki Hipparx; be_x_oldwiki Гіпарх; bewiki Гіпарх; bgwiki Хипарх; cawiki Hiparc . Hiparco de Nicea is on Facebook. Join Facebook to connect with Hiparco de Nicea and others you may know. Facebook gives people the power to share and. . Hipparchus, also spelled Hipparchos, (born, Nicaea, Bithynia [now Iznik, Turkey] —died after bc, Rhodes?), Greek astronomer and mathematician who made .
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Internet URLs are the best. It had been known for a long time that the motion hiparrco the Moon is not uniform: He tabulated the chords for angles with increments of 7. His results were the best so far: Guillerme de Occam nun vitral dun templo en Surrey. Like others before and after him, he also noticed that the Moon has a noticeable parallaxi.
This article is about the Greek astronomer. Hipparchus could draw a triangle formed by the two places and the Moon, and from simple geometry was able to establish a distance of the Moon, expressed in Earth radii. Most of what is known about Hipparchus comes from Strabo ‘s Geography and Pliny ‘s Natural History in the 1st hipaeco Ptolemy’s 2nd-century Almagest ; and additional references to him in the 4th century by Pappus and Theon of Alexandria in their commentaries on the Almagest.
Hipparchus also analyzed the more complicated motion of the Moon in order to construct a theory of eclipses.
Trigonometry was a significant innovation, because it allowed Greek astronomers to solve any triangle, and made it possible to make quantitative astronomical models and predictions using their preferred geometric techniques. Previous to the finding of the proofs of Menelaus a njcea ago, Hipadco was credited with the invention of spherical trigonometry. Toomer”Hipparchus” ; and A. It is not known what Hipparchus’s economic means were nor how he supported his scientific activities.
He also constructed a celestial globe depicting the constellations, based on his observations.
Ptolemy quotes in Almagest III. He nucea have used the equatorial ring of his armillary sphere or another equatorial ring for these observations, but Hipparchus and Ptolemy knew that observations with these instruments are sensitive to a precise alignment with the equatorso if he were restricted to an armillary, it would make more sense to use its meridian ring as a transit instrument.
Rawlins noted that this hipparco a tropical year of In modern terms, the chord of an angle equals the radius times twice the sine of half of the angle, i.
Views Read Edit View history. Rawlins Archived 21 May at the Wayback Machine. These models, which assumed that the apparent hiparci motion was produced by compounding two or more uniform circular motions, were probably familiar to Greek astronomers well before Hipparchus. Hipparchus devised a geometrical method to find the parameters from three positions of the Moon, at particular phases of its anomaly.
A rigorous treatment requires spherical trigonometrythus those who remain certain that Hipparchus lacked it must speculate that he may have made do with planar approximations.
May Learn how and when to remove this template message. Philosophers Playwrights Poets Tyrants. Isis 9358— Hipparchus apparently made many detailed corrections to the locations and distances mentioned by Eratosthenes. A niccea analysis of the Hipparchian fragments still extant, including his hlparco on the Phaenomena of Aratus, indicates that 1 the catalog of Hipparchus did not include more than stars and 2 Ptolemy most likely obtained new coordinates for….
This article’s use of external links may not follow Wikipedia’s policies or guidelines. Analysis of Hipparchus’s seventeen equinox observations made at Rhodes shows that the mean error in declination is positive seven arc minutes, nearly agreeing with the sum of refraction by air and Swerdlow’s parallax.
Hipparchus may have used a globe for these tasks, reading values off coordinate nivea drawn on it, or he may have made approximations from planar geometry, or perhaps used arithmetical approximations developed by the Chaldeans. Hipparchus probably compiled a list of Babylonian astronomical observations; G.
Recent expert translation and analysis by Anne Tihon hiparxo papyrus P. Webarchive template wayback links CS1 maint: It has been contended that authors like Strabo and Ptolemy had fairly decent values for these geographical positions, so Hipparchus must have known them too. Empirista avant l’heureOccam postula que: In Raphael ‘s painting The School of AthensHipparchus is hiparc holding his celestial globe, as the representative figure for astronomy. Espazos de nomes Artigo Conversa.
Like others before and after him, he found that the Moon’s size varies as it moves on its eccentric orbit, but he found no perceptible variation in the apparent diameter of the Sun. A simpler alternate reconstruction  agrees with all four numbers. He tabulated values for the chord function, which gives the length of the chord for each angle. Hipparchus’s draconitic lunar motion cannot be solved by the lunar-four arguments that are sometimes proposed to explain his anomalistic motion.
However, by comparing his own observations of solstices with observations made in the 5th and 3rd centuries bcHipparchus succeeded in obtaining an estimate of the tropical year that was only 6 minutes too long. Hipparchus apparently made similar calculations.
Problem of Apollonius Squaring the circle Doubling the cube Angle trisection. Before him a giparco system had been used by Dicaearchus of Messanabut Hipparchus was the first to apply mathematical rigor to the determination of the latitude and longitude of places on the Earth.
It is known today that the planetsincluding the Earth, move in approximate ellipses around the Sun, but this was not discovered until Johannes Kepler published his first two laws of planetary motion in In geographic theory and methods Hipparchus introduced three main innovations.
Medieval European science Indian astronomy Medieval Hiarco astronomy. Retrieved 6 August Venus, second planet from the Sun and sixth in the solar system in size and mass.
Knowledge of the rest of his work relies on second-hand reports, especially in the great astronomical compendium the Almagestwritten by Ptolemy in the 2nd century ad. The true value is about 60 times.