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Or you could watch videos made on the ISS and see the earth rotate. There are so many ways to prove the point. I often wonder if the idea of believers in a flat earth in the past was not just a relatively recent urban myth to make our modern day selves feel superior.
For example, they say we are in a dome, the sun is a couple thousand miles up and going in a circle above the flat earth map. I'm guessing I need a telescope? I honestly don't feel like spending money or time on this though. Just wondering about what people think.
If the Earth were flat, gravity would work in some very weird unknown way.
Quote from: Alan McDougall on 27/06/2016 22:02:17If the Earth were flat, gravity would work in some very weird unknown way.Actually it's not unknown, but is calculatable. I was thinking of putting the question up.On a spherical earth the downward pull towards the centre is the resultant of the sum of all the vectors from the distributed mass. That means there is a significant, but small, sideways pull which balances out. If the earth were flat you would get a much greater sideways pull if you were at the centre of the disc, would that make us wider than we are?? Towards the edge of the disc, the pull would become asymmetric pulling you back towards the centre of the disc. I haven't got the time to do the calculations, anyone fancy a go?
From 2 meters above sea level, the horizon is about 5.1 km, well within unaided visual range on a clear day.
Formally, it can be a result of somekind of atmospheric refraction.
Coin is flat, but spinning coin looks like a sphere.
Quote from: YarS on 01/07/2016 21:06:15Formally, it can be a result of somekind of atmospheric refraction.Refraction moves the apparent position of an object complete with its horizon, it does not produce an obscuring effect.
Spinning at that speed, the stars would appear to be a blur.
If you have an alternative theory to the spherical earth please post it in New Theories or It Can't Be True. See http://www.thenakedscientists.com/forum/index.php?topic=66954.0
The best evidence that the world is flat is the way projectiles move under the influence of gravity, it is widely reported that they move in a parabolic path which only happens because the world is flat and of infinite extent.if the earth was spherical they would take an elliptical path
According to GR, doesn't mass and gravity cause space-time to curve. So, it is possible that space-time is curved, but the earth is flat?
In other words, if the earth suddenly loss all its mass, but retained all its substance ...
..(without mass) space-time around the earth would lose curvature, therefore wouldn't the earth flatten?
The best, well I think so, way of demonstrating that the earth rotates, thus it must be round given that the sun comes up and sets at different times as you go East/West is the droped rock experiment;Get a rock and tie a piece of cotton thread arond it so you can suspend it from a high point. This will have to be done in doors where there is no wind to push it off course. Churches are good for this but any high place will do, stairwell for example.Have the rock dangle from the high point so it touches the ground. Make sure it's settled down and is not swinging about. Mark the position on the floor. Then take the rock up to the top of what ever you suspended it from, a nail or hook or what ever. It will swing about horizontaly as you do this. Calm it down and have it a couple of inches below the high point.The position you have marked on tghe floor is directly below the high point where you now have the rock.Cut the cotton thread with something that will impart no sideways motion. Burning through it with a lighter will do nicely. The rock will drop down and hit the floor a little East of the point directly below the high point. This is because the ceiling is traveling faster than the floor. When the rock leaves the ceiling it has the same speed as the ceiling and whilst it is dropping down to the floor it is traveling slightly faster than the bits of wall it's passing. It might be good to use a sand tray to both mark the position and to drop the rock onto as this will show the difference between the two and stop the rock bouncing all over the place. You can calculate the size of the earth and your lattitude from this should you want to do the maths.
Telescope is arriving in a week I hope.I don't have access to satellites or projectiles, unless it's a bb gun. Maybe I can do an experiment with that.I like the rock experiment Tim. Might take a bit of work setting it up. If my telescope experiment suggests the earth is flat (disproves spherical model) then I'll do the rock thing next.Honestly, I think it's a bit exciting if the earth is flat. Makes you wonder and changes your whole world view.
Quote from: syhprum on 10/07/2016 06:48:24The best evidence that the world is flat is the way projectiles move under the influence of gravity, it is widely reported that they move in a parabolic path which only happens because the world is flat and of infinite extent.if the earth was spherical they would take an elliptical pathHa ha. Very funny. :/
Contrary to Foucault pendulum, your experiment works best at equator and won't work at earth poles.You would need a considerably tall building to get noticeable result.
Who cares what anyone else says? Other people believe in all sorts of drivel and even vote for Trump. All that matters in science is what you do, what you observe, and how you explain it. There's sometimes a consensus among sane and honest people, but even that can be wrong.
If the earth is flat, it won't have an equator or poles.
Quote from: puppypowerAccording to GR, doesn't mass and gravity cause space-time to curve. So, it is possible that space-time is curved, but the earth is flat? Mass can cause spacetime to curve. However its incorrect to say that gravity causes it to curve because spacetime curvature manifests itself as gradients in the gravitational field. In other words, spacetime curvature and tidal gradients are exactly the same thing.Quote from: puppypowerIn other words, if the earth suddenly loss all its mass, but retained all its substance ...Which is impossible.Quote from: puppypower..(without mass) space-time around the earth would lose curvature, therefore wouldn't the earth flatten?No. There would be no reason for a spherical body to change its shape if it started out as spherical and no external forces are acting on it.
Quote from: alancalverd on 28/07/2016 17:23:59If the earth is flat, it won't have an equator or poles.If the earth is flat, it may have one pole and one boundary. The circle centered at the pole having radius half the earth's radius is then called the equator.They often refer to UN emblem.
Of course the earth is flat... there is so much here to prove it......http://www.theflatearthsociety.org/home/index.php/flat-earth-library/library-booksLOL.