Who figured out the circumference of the earth?
singleAnswer
Eratosthenes of Cyrene Eratosthenes
Eratosthenes
Who figured out the circumference of the earth?
Eratosthenes Earth's circumference Spherical Earth History of geodesy Earth radius Earth French Geodesic Mission String girdling Earth Flat Earth Aristarchus of Samos
Eratosthenes of Cyrene was a Greek polymath: a mathematician, geographer, 
poet, astronomer ... Eratosthenes calculated the <b>Earth&#39;s circumference</b> without 
leaving Alexandria. He knew that ... Pharaonic bookkeepers gave a distance 
between Syene and Alexandria of 5,000 stadia (a <b>figure</b> that was checked yearly)
. Some&nbsp;... <b>Earth&#39;s circumference</b> is the distance around the <b>Earth</b>; around the poles it 
measures almost ... between the two locales was 1/48 of the circle, he multiplied 
5,000 by 48 to arrive at a <b>figure</b> of 240,000 stadia for the <b>circumference of the</b> 
<b>earth</b>. The earliest documented mention of the spherical <b>Earth</b> concept dates from 
around the 5th ... For the measurement, see Earth&#39;s circumference. ... The 
realization that the <b>figure</b> of the <b>Earth</b> is more accurately described as an ellipsoid 
dates to ... energy can also move water, rock, and soil to make the <b>Earth</b> slightly 
<b>out</b> of round. They <b>found</b> the cities to be separated by one degree of latitude and the distance 
between them to be 66​<sup>2</sup>⁄3 miles and thus calculated the <b>Earth&#39;s circumference</b> 
to&nbsp;... <b>Earth</b> radius is the distance from the center of <b>Earth</b> to a point on its surface. Its 
value ranges ... The symbol given for the named radius is used in the formulae 
found in this article. ... giving a sphere with <b>circumference</b> equal to the <b>perimeter</b> 
of the ellipse described by any polar cross section of ... Guam.<b>discover</b>-theworld.
com. <b>Earth</b> is the third planet from the Sun and the only astronomical object known to 
harbor life. ... In theory, a solar nebula partitions a volume <b>out</b> of a molecular 
cloud by ... The third form of rock material <b>found</b> on <b>Earth</b> is metamorphic rock, 
which is ... <b>Earth&#39;s circumference</b> is almost exactly 40,000 km because the metre 
was&nbsp;... The French Geodesic Mission was an 18th-century expedition to what is now 
Ecuador carried <b>out</b> for the purpose of measuring the roundness of the <b>Earth</b> and 
measuring the length of a degree of latitude at the Equator. The mission was one 
of the first geodesic (or geodetic) missions carried <b>out</b> ... as to whether the 
<b>circumference of the Earth</b> was greater around the Equator&nbsp;... Visualisation showing that the length added to the <b>circumference</b> (cyan) is 
dependent only on the additional radius (red) and not the original <b>circumference</b> (
grey). String girdling <b>Earth</b> is a mathematical puzzle with a counterintuitive 
solution. In a common ... A corollary is that, to raise the original string 16 cm (6.3 
in) <b>off</b> the ground all&nbsp;... The flat <b>Earth</b> model is an archaic conception of <b>Earth&#39;s</b> shape as a plane or disk. 
Many ancient ... A similar model is <b>found</b> in the Homeric account from the 8th 
century BC in ... the <b>circumference of the Earth</b>, but the Zhoubi Suanjing assumes 
that the <b>Earth</b> is flat. ... The Quran mentions that the <b>Earth</b> (al-arḍ) was &quot;spread 
<b>out</b>&quot;. Aristarchus of Samos was an ancient Greek astronomer and mathematician who 
presented the first known heliocentric model that placed the Sun at the center of 
the known universe with the <b>Earth</b> revolving around it. ... But Aristarchus has 
brought <b>out</b> a book consisting of certain hypotheses, wherein it appears, as a&nbsp;...
Eratosthenes
Eratosthenes