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The concept of the spherical Earth dates back to Ancient Greece. Seeing high mountains in the distance before lower ground, the Earth creating a circular shadow during an eclipse and circumnavigation are all evidence of the Earth's sphericity.

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 ... It has been suggested that seafarers probably provided the first observational evidence that the Earth was not flat, based on ...

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

Jan 26, 2016 ... The evidence is right in front of you ... Humanity has known the Earth to be round for a few millenia and I've been meaning to show more ...

gizmodo.com/how-to-prove-to-yourself-or-shaq-the-earth-is-round-1793441692

Mar 20, 2017 ... How to Prove to Yourself (or Shaq) the Earth Is Round ... But the Earth being a spinning ball is central to many people's jobs, to our .... equally to the ancients and to us) are, I would say, a far earlier successful rigorous proof.

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

I believe that it was Pythagoras who first proposed that the Earth was round ... Moon during a lunar eclipse was also used as evidence that the Earth was round.

www.pbs.org/newshour/updates/7-diy-experiments-b-o-b-the-earth-is-round

Jan 27, 2016 ... “The Earth is round.” Teachers say it. Scientists say it. But how do they know? I ask because an Internet conversation has surfaced among ...

futurism.com/facts-obvious

Jan 26, 2016 ... We knew that Earth was round long before we ever went to space. Recently, a lot of ... He went on and on offering “evidence” that Earth is flat.

www.lhup.edu/~dsimanek/flat/round-spin.htm

All the evidence from our space programs, those of many countries, are consistent with the round, rotating earth and the conventional solar system cosmology, ...

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

5 days ago ... A century and a half later, Aristotle put forward what was likely the physical evidence that the Earth is round, according to the American Physical ...

www.smarterthanthat.com/astronomy/top-10-ways-to-know-the-earth-is-not-flat

Aug 19, 2008 ... This is because the earth is round, and not flat: ..... @Austruth Yeah, well we wait for your proofs and evidence that such technology as "big ...