What was the name of the guy who said world was round and used the round shadow of Earth on the moon as proof?
82737
Anaxagoras.\n\n\nPythagoras first reasoned that the Moon must be a sphere because the line between light and dark is curved.\n\nAnaxagoras used the Earth shadow during eclipse to confirm the Earth is a sphere.\n\nAnd Aristotle came to the same conclusion because he noted how the constellations "move" when you get farther from the equator.
422506
He was a map maker before he went out sailing.  For sure it was he who realized that what had been discovered was a new continent, not East Asia, and it was his writings that flew across Europe and made people aware of this new continent.\n\nHe claimed that he knew a new land had been discovered by determining the longitude of the eastern South American continent, but it turns out this claim of his was a lie.  He was something of a rogue...\n\nSo probably, he realized a new land had been discovered because he had been into map making so long that it just came to him.
409340
John Harrison developed longitude.\n\nLatitude is a bit more difficult to determine and is mostly about mathematics but I believe mathematician Karl Gauss had something to do with it. But you should research that some more.
42171
A fact is that the world is round (it can be proved). An opinion is the world is flat (a statement that can be proved wrong).
11338
The earth is round. There are some physical proofs below, assuming you don't trust the pictures of the Earth taken from the various space programs.
324293
I wonder how many people out there are too lazy to do some real research and read the scientific facts proving that man has landed on and partially explored the Moon. Here's a good place to start: http://www.badastronomy.com/bad/tv/foxapollo.html  On this website each and every "fact" claiming that the Moon landings were all faked are ripped to shreds.\n\nMy favorite "fact" is about the 'waving' flag on the airless Moon. Doesn't take a rocket scientist to understand how the flag can be made to appear to be waving. Duh!\n\nNobody from the Faked Moon Landing bunch has ever answered my question about several hundred pounds of rock and soil brought back that research groups AROUND THE WORLD unanimously agreed was non-terrestrial.\n\nGod should be spelled B-I-G B-A-N-G\nPBrax@netscape.com
525104
Fermat, I think.  He wrote he had found a proof for this, but put a note in the margin that there wasn't enough room there for the proof.  And no-one could find the proof anywhere else in his notes and he died.  A fellow named Andrew Wiles worked for a long time to find the proof, and after some ill-fated public announcements I think the proof was finally completed.\n\nI hope this helps.
1115991
The ancient greeks knew the earth was round.  They knew it because they watched ships sail off.  Someone with good eyes could see that the ship was going over the horizon, the bottom of the ship dissappeared first.  Also, they knew that an eclipse of the moon showed the shadow of the earth on the moon.  Erastothenes calculated the diameter of the earth in about 200 bc.  He was accurate to about 3%.
172697
Beginning in the 1970's, Hartmann and many others theorized and offered "proof" that our moon was formed billions of years ago when a planetesimal about the size of Mars impacted Earth. Today, this theory is almost totally accepted.
24073
It was Pythagoras who was the first to question the flat earth theory, although probably just the most famous....incidently it was considered heracy at the time.
975884
What? You mean those volumes of factual research written by scientists. The same scientists that said the world was flat. The same scientists that said the atom could not be split. The same scientists who said we would never put a man on the moon. O.K. I believe in the Bible because I know it is true. It was inspired by a God who knows everything.
280298
you are stupid. would a computer say that. yes, the earth is round.
252263
Yes it is  well documented that we did.\nIt really would have been impossible to fake. and even more impossible to conceal a hoax of that magnitude for this long.\n\nThere is a vast deal of technology that came from the space  program .\nThe Apollo spacecraft was seen during its trans-Lunar coast by observers on Earth. Amateur astronomers were able to sight the spacecraft, exactly where they should have been, during the trans-Lunar coast and amateur radio operators were able to listen-in on the command module in Lunar orbit. The explosion of Apollo 13 was caught on video tape by an amateur astronomer. Russia and radio telescope observatories not owned or controlled by the USA also tracked the Apollo spacecrafts and transmissions.
576059
The earth isn't round. It's a squashed sphere, due to it's rotation.\n\nI wish grass fell from the sky. I have to go find a guy who knows a guy to get my grass.
700051
1. Eclipses, and lunar phases. \n2. The other "celestial" bodies, like the sun, moon and planets also appear round. One might assume, that the earth might be also.  \n3. Gravitational laws based on the earth being a certain shape and size, predict movement, etc. \n4. The stars in the southern hemisphere are  different than in the northern hemisphere.\nIf the earth was flat, one should be able to see the all of the stars at least some of the time. \n5. Sailors regularly circumnavagate the earth.\n6. Planes regularly fly around the world.\n7. The seasons and the climatic zones are hard to explain otherwise. \n8. The coreolis forces of hurricanes.\n\nOne can use scientific method to prove all of these and come up with conclusions for an earth that is somewhat round in shape, if one isnt lucky enough to see it from space, and believe it with your own eyes.
465729
Two possibilities not previously mentioned: first, phone your various friends around the world, and ask them the time! You will then find out that the sun is at a different height in the sky at different places. So at least the world is not flat, since the sun is very much farther out than the distances between any two points on earth.\n\nSecond, wait for a lunar eclipse. This is the Earth's shadow projected on the moon. It is round. The Earth is not a disk (see first experiment) but casts a round shadow: a sphere seems indicated. In fact, it is a sliughtly flattened sphere (ellipsoid, in fancy language)
419322
It was believed that he saw the shadows of the pillars on the tiled temple floor, that looked like a right angled triangle with squares attached. \nFrom there he developed his theory that the square drawn on the hypotenuse of a right angled triangle, is equal in area to the sum of the squares drawn on the other two sides.\nPythagoras put forward a proof, but said proof contained errors to do with transient numbers, however it seemed the theory was sound.\nSome two centuries later the Great Euclid himself proved it, with his brilliant proof using congruent triangles, true poetry of geometry.