Bill Wringe - 2011 - Prolegomena 10 (2):185-213. Google Classroom Facebook Twitter. Posidonius Miscalculation Led To Columbus’ Discovery Of America. Posidonius attempted to calculate the circumference of the Earth by assuming the cities of Rhodes (Greece) and Alexandria (Egypt) were on the same meridian. Academia.edu is a platform for academics to share research papers. Earth's circumference is the distance around Earth. Find it on Scholar. Export citation. Posidonius was from a Greek family though he was born in Syria. Sprache; Beobachten; Bearbeiten; Datei; Dateiversionen; Dateiverwendung; Globale Dateiverwendung; Größe der PNG-Vorschau dieser SVG-Datei: 316 × 342 Pixel. Posidonius used the star Canopus as frame of reference: when the star is visible at the horizon. Journal: Quarterly Journal of the Royal Astronomical Society, Vol. Email. Posidonius of Rhodes is also known as Posidonius of Apameia (c. 135 BCE – c. 51 BCE), was a Greek politician, astronomer, geographer, historian, and teacher who was considered the most learned man of his time. III- The Translation of the Fragments. Posidonius (crater) - Wikiwand. The better-known contemporary of Theodosius, Posidonius (ca. John Glucker - 1999 - Phronesis 44 (1):30-44. Weitere Auflösungen: 222 × 240 Pixel | 443 × 480 Pixel | 554 × 600 Pixel | 710 × 768 Pixel | 946 × 1.024 Pixel. Eratosthenes — from Wikipedia. By some scholars, who view the history of mapping as mainly concerned with the diagnosis of Using elegant mathematical reasoning and limited empirical measurement, in approximately 240 b.c., Eratosthenes of Cyrene (276-194 b.c.) However, the version of Posidonius’ calculation popularised by Strabo was revised by correcting the distance between Rhodes and Alexandria to 3,750 stadia, resulting in a circumference of 180,000 stadia, or 18,000 miles. Posidonius made a portable, spherical orrery illustrating the motion of the sun, moon, and five planets round the earth. 16.2: Eratosthenes, Posidonius, and El Mamun Last updated; Save as PDF Page ID 4702; Contributed by CK12; CK12 ; No headers. Why Take Chemistry Stoically? Craters Posidonius at Sunrise - Sketching - Cloudy Nights. Eratosthenes used this to estimate the Earth’s circumference as approximately 40,000 km (24,856 mi). For since they are not impeded any more in the same way by the last circumference, the lesser spheres, because of the distance, move with a speed equal to the spheres which are larger than they are. Datei:Posidonius earth circumference.svg. 135-51/50 B.C. Posidonius is responsible for an early measurement of the circumference of the Earth. I. Drabkin - 1943 - Isis 34:509-512. Later, another scientist called Posidonius (135 BCE to 51 BCE) used a slightly different method and arrived at almost exactly the same answer. 4.3—Ways of Knowing: Our Solar System and Earth. A century after Eratosthenes, the Greek astronomer Posidonius of Rhodes (c. 135–51 BCE) calculated the Earth’s circumference. Using a distance of 5000 stadia between Rhodes and Alexandria this gave Posidonius a value of 240000 stadia for the circumference of the earth. Mark as duplicate. Measured around the poles, the circumference is 40,007.863 km (24,859.734 mi). "Another look at Eratosthenes' and Posidonius' Determinations of the Earth's Circumference" by Irene Fischer, Quarterly Journal of the Royal Astronomical Society, vol. Here are a few things that have been said about my work: Eratosthenes of Cyrene. By multiplying 48 by … Griechische Astronomie: Die Messung des Erdumfangs nach Posidonius Eratosthenes determined the circumference of the Earth around 205 BC to be 250000 or 252000 stades according to various sources.He noted that, on the summer solstice, the sun casts no shadow in Syene but he knew that it casts a shadow in Alexandria, north of Syene, corresponding to an angle α = 7 o 12' (or approximate … The measurement of the Earth’s circumference was repeated several decades later by Posidonius. The Case of Posidonius. The maps of Ptolemy strongly influenced the cartographers of the Middle Ages. Posidonius used the stars to determine the earth's circumference. 17 Centaurus XVIII C. M. Taisbak Astronomer to believe that 180000 stades are what the meridian circumference of the earth amounts to. Posidonius (c. 135 – 51 BC) put faith in Eratosthenes's method, though by observing the star Canopus, rather than the Sun in establishing the Earth's circumference. 16, p.152 Bibliographic Code: 1975QJRAS..16..152F. The distance between these two cities was 5,000 stadia. Posidonius and the Circumference of the Earth. WELCOME TO MY SCIENCE WALKS WEBSITE! This is within a couple of percent of the actual value, as established by modern geodesy (the science of the Earth’s shape). He also thought that the star Canopus touched the horizon at Rhodes at a meridian altitude of 7 30' or V48 of the circumference of a circle at Alexandria. He observed that a given star could be seen just on the horizon at Rhodes . Posidonius’ “sling”, complete with looped handles. Revising the figures attributed to Posidonius, another Greek philosopher determined 18,000 miles as the Earth's circumference. So Posidonius was beyond doubt an Evil Stoic. Posidonius measured Earth's circumference from the position of the star Canopus. This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific measurement and calculation was done by Eratosthenes, who achieved a great … He was raised in the Greek tradition and completed his education in Athens under the great Stoic philosopher Panaetius of Rhodes. In Ptolemy's Geographia , his result was favoured over that of Eratosthenes. ), is generally associated with his measurement of the circumference of the earth. (fix it) Keywords No keywords specified (fix it) Categories History of Science in General Philosophy of Science (categorize this paper) DOI 10.1086/347875: Options Edit this record. A delightful illustrated book for early readers about Eratosthenes, The Librarian who Measured the Earth by Kathryn Lansky (illustrated by Kevin Hawkes), Little Brown and Co., 1988, 1994. Posidonius on Emotions and Non-Conceptual Content. This is 15%. The Greek philosopher Aristotle (384-322 BC) argued in his writings that the Earth was spherical, because it casted a circular shadow on the Moon during a lunar eclipse. Title: Another Look at Eratosthenes' and Posidonius' Determinations of the Earth's Circumference Authors: Fischer, I. The spherical sun, a star of pure fire, is about 3 million stades in diameter; the moon about 2 million stades from the earth, which is smaller than the moon and sun, and the sun is 500 million stades beyond the moon. A Platonic Cento in Cicero. Only erred in 6.192 kms. This last figure was promulgated by Ptolemy through his world maps. QUOTES BY POSIDONIUS | A-Z Quotes. Earth Circumference Measurement by Posidonius. Due to observational errors, his result was 240,000 stadia, or about a third smaller than the actual circumference of the Earth. Both figures used by Posidonius in the above calculation are inaccurate. So Posidonius is a poor earth estimator and a bad man; and what is worse: he misled Ptolemy the Institute of classical philology, University of Copenhagen, Fiolstrcede 10, DK-I 171 bbenhavn K, Denmark. Taking the Earth as spherical, and knowing both the distance and direction of Syene, he concluded that the Earth's circumference was fifty times that distance. Both men’s figures for the Earth’s circumference were uncannily accurate, aided in each case by mutually compensating errors in measurement. His knowledge of the size of Egypt was founded on … Posidonius Greek Stoic Philosopher by Mary Evans Picture Library. Posidonius was informed in his approach to finding the Earth's circumference by Eratosthenes, who a century earlier arrived at a figure of 252,000 stadia; both men's figures for the Earth's circumference were uncannily accurate. Measured around the Equator, it is 40,075.017 km (24,901.461 mi). accurately measured the Earth's circumference. Feel free to browse my books, guides and educational resources. I. Drabkin. The measure of the circumference of the earth made by advanced satellites is approximately 40.008 kilometers. Posidonius and the Circumference of the Earth. As explained by Cleomedes, Posidonius used the elevation of Canopus, to determine the difference in latitude between Rhodes and Alexandria. Ernesto Paparazzo - 2008 - Foundations of Chemistry 10 (1):63-75. He then measured the star's elevation at Alexandria , Egypt , and calculated the angle of difference to be 7.5 degrees or 1/48th of a circle. In Rhodes, it is 7.5 degrees above the horizon in Alexandria. Isis 34:509-512 (1943) Abstract This article has no associated abstract. adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A Eratosthenes Calculates the Circumference of the EarthOverviewThe measurement of distance became increasingly important to ancient and classical civilizations as their territorial and cultural horizons expanded. This turned out to be about 7°, or 1/50th the circumference of a circle. 16, p. 152-167, 1975. Considering the simplicity and rudimentary but ingenious technique used by Eratosthenes, its calculus approximation was amazing. Posidonius, Vol. This a very accurate value, but it is produced because of two compensating errors. The motion of the Earth Sunrise - Sketching - Cloudy Nights rudimentary ingenious... 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