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en.wikipedia.org/wiki/Spherical_Earth

The earliest reliably documented mention of the spherical Earth concept dates from around the 6th century BC when it ..... He found the radius of the earth to be 6339.6 km, a value not obtained in the West until the 16th century. His Masudic ...

scienceblogs.com/startswithabang/2011/09/21/who-discovered-the-earth-is-ro

Sep 21, 2011 ... “When Columbus lived, people thought that the earth was flat. They believed the Atlantic Ocean to be filled with monsters large enough to ...

starchild.gsfc.nasa.gov/docs/StarChild/questions/question54.html

I believe that it was Pythagoras who first proposed that the Earth was round ... and further away from the equator) and during the next hundred years or so, ...

www.bbc.com/earth/story/20160126-how-we-know-earth-is-round

Jan 26, 2016 ... We have known that Earth is round for over 2,000 years ... we think it's fun to know how these big facts about the universe got discovered.

www.aps.org/publications/apsnews/200606/history.cfm

By around 500 B.C., most ancient Greeks believed that Earth was round, not flat. ... about 240 B.C., when Eratosthenes devised a clever method of estimating its circumference. ... They found that Syene lies about 5000 stadia from Alexandria.

www.quora.com/Who-was-the-first-person-to-prove-the-Earth-was-round

Actually, some cultures knew Earth to be round long long ago and didn't have a need to prove it ... the concept of a spherical Earth, how was that concept proven and by whom? ... When did science prove that the earth was round? Let's say I ...

www.discovery.com/dscovrd/nature/no-earth-isnt-flat-heres-how-ancients-proved-it

Jan 28, 2016 ... Scholars have known for thousands of years that Earth is round. One rapper thinks they've got it all wrong.

www.popsci.com/10-ways-you-can-prove-earth-is-round

Jan 26, 2016 ... Humanity has known the Earth to be round for a few millenia and I've been ... of the Earth) noticed that during lunar eclipses (when the Earth's orbit .... After all, we have life, and we haven't found any other planets with life (yet).

futurism.com/facts-obvious

Jan 26, 2016 ... We knew that Earth was round long before we ever went to space. ... of two and two equaling four, the Earth traversing around the Sun once a year (not ... The heliocentric model was proposed by Copernicus, and proven by ...

boards.straightdope.com/sdmb/showthread.php?t=642659

When I was a schoolboy way back in the 20th century, we were taught that the mighty Christopher Columbus proved the Earth was round.