Greek estimate of earth's circumference

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August undefined, 2024

WebIn the third century BCE, Eratosthenes, a Greek librarian in Alexandria, Egypt, determined the earth's circumference to be 40,250 to 45,900 kilometers (25,000 to 28,500 miles) by comparing the Sun's relative … WebThen he could measure the angular distance in the sky between the Sun and the Moon, plus the Earth-Moon distance and geometry, to get the Earth-Sun distance. The most famous ancient estimate of the earth's circumference as made by Eratosthenes of Cyrene (c. 276-196 BCE), the librarian at the great library at Alexandria.

Eratosthenes

WebFeb 3, 2024 · So in other words, 5000 stades along the circumference of the Earth was equal to 7.2 degrees of arc along the circumference of the Earth. And because 7.2 degrees is equal to 1/50th of a full sphere … WebThat unit is mentioned by Pliny when he equated 40 of them to 12,000 royal cubits, of which each is about 0.525 meters. Therefore, 1 stadia is 300 cubits, which is 157.5 meters, which is about 516.73 feet. Therefore, … cscs or citb

How was the size of Earth first measured? StarDate Online

WebOver 2000 years ago, the Greek scholar Eratosthenes estimated Earth's circumference by assuming that the Sun's rays were parallel. He chose a day when the Sun shone straight down into a well in the city of Syene. At noon, he measured the angle the Sun's rays made with a vertical stick in the city of Alexandria. WebFeb 15, 2024 · The first known person to calculate the circumference of the earth was the Greek astronomer Eratosthenes (as the legend goes, without leaving Egypt), during his lifetime between the 3rd and 2nd ... csc-southampton

How Long Is a Stade? - Mathematical Association of America

23, 1943 NATURE 473

WebAbu Rayhan al-Biruni (AD 973--1048) The 11th century Persian mathematician Abu Rayhan al-Biruni used simple trigonometric results to estimate the radius and circumference of the Earth. This content is … WebThroughout history, the shape of the Earth has been debated by scientists and philosophers. By 500 B.C. most scholars thought the Earth was completely spherical. The Greek philosopher Aristotle (384-322 B.C.) is credited as the first person to try and calculate the size of the Earth by determining its circumference (the length around the equator) … cscs or smstsWebSee Answer. Question: 1.Eratosthenes was a Greek writer and astronomer who estimated the circumference of the Earth using the ideas in 1, 2, 3 above. He noticed that, at noon on summer solstice in a place called Syene, the sun’s rays went directly down a well. At the same time, in Alexandria, the sun cast a shadow of 7.5 off a vertical object. dyson dc15 cyclone assembly

"WebEratosthenes reasoned that the ratio of the angular difference in the shadows to the number of degrees in a circle (360°) must equal the ratio of the distance to the circumference of … " - Greek estimate of earth's circumference

Greek estimate of earth's circumference

Webthis means he found that the circumference of the earth was 250,000 stadia, according to Cleomedes, but Strabo says that it was 252,000 stadia. A dis ... The Greek stadium was 606·75 ft., WebOct 8, 2012 · In 200 BCE, after all, Eratosthenes calculated the circumference of the earth to within one percent of its actual girth. He figured that one degree of latitude was equal to 59.5 nautical miles.

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http://www.geo.hunter.cuny.edu/~jochen/gtech201/lectures/lec6concepts/Datums/Determining%20the%20earths%20size.htm WebThe goal of this project is to estimate the circumference of the earth by setting up a mathematical proportion from simple measurements. Introduction In this project, you will estimate the circumference of the earth, using a method developed about 2,200 years ago, by Eratosthenes, a Greek mathematician and the librarian of the great library at ...

WebA stade was an ancient Greek unit of measurement (150-200 meters). He also assumed that Syene was due south of Alexandria and on the same meridian of longitude. ... He also estimated the circumference of the … WebEarth's circumference is the distance around Earth. Measured around the Equator poles. Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific measurement …

WebThe actual polar circumference of Earth is just a bit over 40 thousand km (about 24,860 miles). Eratosthenes was a talented mathematician and geographer as well as an … WebEratosthenes (c. 276 – c. 194/195 BC), a Greek mathematician who calculated the circumference of the Earth and also the distance from the Earth to the Sun. Hipparchus (c. 190 – c. 120 BC), a Greek …

WebJan 11, 2024 · Back in 240 B.C.E., a Greek named Eratosthenes calculated the circumference of the earth. Today we know how to measure circumference of many things, including earth, using many modern tools, but Eratosthenes did it with a well, the sun, and a stick. Setting the cosmological stage. Our sun is very far away from earth, …

WebDec 19, 2013 · Harilal Krishna. Advertisement. Eratosthenes Eratosthenes, a Greek Mathematician, lived in Alexandria, Egypt, in the third century BC. Born 276 BC Cyrene Died 194 BC Alexandria Ethnicity Greek … dyson dc15 cyclone handleWebMay 28, 2024 · This means that you have moved 30 degrees around the Sphere (Earth) in those 400 miles. Well, since there are 360 degrees in a circle and 30/360 = 1/12, then 400 must be 1/12th of the total circumference of the Earth. So the circumference of the Earth is 12 * 400 or 4800 miles. Now take note: these numbers are made up and do not reflect ... csc southfield miWebJun 8, 2024 · Mathematicians of his time had estimated Earth’s circumference to be “400,000 stadia”, or 62,880-66,680km (39,000 … cscs outlookWebSep 4, 2024 · The circumference of the earth was 40,000 kilometres, according to Eratosthenes' calculations. cscs out of dateWebWith a stade of 185 m (607 ft), 804,000,000 stadia is 149,000,000 km (93,000,000 mi), approximately the distance from the Earth to the Sun. Eratosthenes also calculated the Sun's diameter. According to … cscs paper testWebEratosthenes made a calculation by multiplying the distance by the angle. He was able to determine the Earth's circumference and then another calculation to work out the diameter. Confusingly, there were 2 different measurements for a stadia but scientists believe he used a unit which led to the circumference being within 1 degree of the modern ... cscs panWebUse the measurement to find that the angular Separation on the Earth's surface of Alexandria and syene is 7 degrees. 3 substitute values into angle between cities / 360 degrees equals the distance between cities divided by the Earth's circumference. 4 solve the equation to calculate the circumference of the Earth. dyson dc15 beater bar