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Ancient Greek philosophers posited that the Earth was round as early as 6th Century B.C.
It is not definitively known which scientist first proved that the Earth is spherical. The discovery is variably attributed to Pythagoras, Zeno, or Hesiod.

en.wikipedia.org/wiki/Spherical_Earth

The earliest reliably documented mention of the spherical Earth concept dates from around the .... "My conviction is that the Earth is a round body in the centre of the heavens, and therefore has no need of air or of any similar force to be a support". .... Some ideas were found possible to preserve, although in altered form.

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

It has actually been known that the Earth was round since the time of the ancient Greeks. I believe that it was Pythagoras who first proposed that the Earth was ...

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

Jan 26, 2016 ... The fact that Earth is round has been common knowledge ever since ... He discovered that at noon in one Egyptian city, the Sun was directly ...

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.

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

Sep 21, 2011 ... So give the credit where credit is due, to Eratosthenes, for discovering the Earth was round, and performing the first accurate calculation of its ...

www.livescience.com/16468-christopher-columbus-myths-flat-earth-discovered-americas.html

Oct 9, 2011 ... Find out why we celebrate Columbus as the man who discovered the ... Greek mathematicians had already proven that the Earth was round, ...

futurism.com/facts-obvious

Jan 26, 2016 ... We knew that Earth was round long before we ever went to space. ... were, myself included, and he is still credited by some for this discovery.

www.seeker.com/no-earth-isnt-flat-heres-how-ancients-proved-it-1770796992.html

3 days ago ... Scholars have known for thousands of years that Earth is round. One rapper thinks they've got it all wrong.

www.hurriyetdailynews.com/muslims-discovered-earth-is-round-turkeys-science-minister-says.aspx?pageID=238&nID=74989&NewsCatID=338

Nov 29, 2014 ... After President Erdoğan s Muslims discovered America claim, a Turkish ... that the Earth is a sphere, Turkey's science, industry and technology ...