It is not possible for me to do examinations such as using laser or send a balloon at high altitude to find out if the earth is global or flat. So I can not trust examinations that performed by others. Is there any available evidence to show the earth is flat? I've studied about the FE theory and all of the evidences such as lunar eclipse at day, the moon rotation at night etc. are justifiable in global earth!
The simplest proof that I have found is the simple observations of a sunset.
Most Flat Earther's won't even enter into discussions about it. The single, solitary FE'er who does enter those discussions (Tom Bishop) ends up being forced to deny that diagrams are a valid debating tool or that mathematics works at all...at one point even asserting that 2+2 may not equal 4.
So - let's walk through that argument for you:
* We see sunsets. It's undeniable.
* The FE'ers claim that the sun hovers over their flat earth at a constant altitude of 3,000 miles.
* We know that when the sun sets in my time-zone, it's more or less overhead (depending on latitude and time of year) at some location that's about 6 time-zones away to the west of me.
* Although some FE'ers deny that they know the map of the world, it's clear that any place as far away as 6 time zones must be between (say) 3,000 miles and 9,000 miles away...I choose 6,000 miles (which would be the Round Earth distance) but I'm happy to be corrected.
* Simple geometry says that if the sun is 3,000 up and 6,000 miles away horizontally - then the angle at my eye between sun and horizon should be somewhere around 30 degrees. Sure - with different maps, different times of year, different latitudes - the angle could be maybe 20 degrees or 45 degrees. Doesn't really matter - it's not ZERO.
* So it follows that in the flat earth, the sun would never set. Oh dear...that's a problem, because it does set.
* Consider a tree, on the western horizon. The sun is setting behind it. Now, photons from the sun have to descend from 3,000 miles up - skim through the leaves of the tree and then move parallel to the surface of the (flat) earth to reach my eye. So either the light takes a 30 degree turn when it passes the tree - or it follows some kind of graceful curve that takes it along that path.
* That would mean that light doesn't travel in straight lines.
OK - so the FE'ers appear to have two different "solutions" to this problem:
1) What I call "magic perspective" - one or two of them claim that perspective doesn't work like everyone except them believe it does. They somehow claim that light does travel in straight lines - but "perspective" solves all of the logical issues I pointed out above. This doesn't make sense - and if you steadfastly insist on knowing the physical path that the photons travel along from the sun to your eye - then they stop debating the point. Tom Bishop (principle proponent of this crazy idea) has twice promised to start a new thread to explain all of this. Both times he has failed to do so. That's because he CANNOT explain this. He's wrong and he's smart enough to know it.
2) Something called "Electromagnetic Acceleration" (EA) - which basically says that light doesn't travel in straight lines. Interestingly, there are equations on the Wiki that purport to solve this problem - but they don't work. They claim that these are just simplified versions of the "REAL" equations - but repeated requests to be shown the "REAL" equations have been met with silence. Worse still - if you think carefully about the implications of this theory, you'd realize that there would be no nighttime. The "flashlight sun" hypothesis would break down because no matter how narrow it's beam, it would be flattened out by EA and shine horizontally (or near horizontally) across the entire planet.
Both of these hypotheses also predict some other oddities:
* They can explain (well, kinda) that light rays from the sun 3,000 miles up can skim along parallel to the ground at sunset - but they can't explain how the undersides of clouds are lit by the sun for a while AFTER sunset. Airplanes are also lit from beneath. You can also see shadows being cast by tall mountains onto the undersides of the clouds. These phenomena can only work if the sunlight is coming from BENEATH the flat earth's surface.
* The sun is claimed to be 31 miles in diameter. If the flattening of light from 3,000 miles up produces a ray that runs parallel to the ground between the tree on the horizon and my eye - then light from 3,015 and 2,985 miles up ought to be very nearly parallel to the ground also. This would result in the sun slowly changing from a perfect circle into an ellipse as it descends to the horizon. And at the moment of sunset, instead of seeing a half-circle of sun peeking over the horizon - you'd see a much brighter horizontal line.
So you don't need fancy instruments.
You don't need clever math.
You don't need to look at videos from NASA that might somehow have been faked.
All you have to do is to look at a sunset and think about how this is possible and the entire Flat Earth wobbly tower of bullshit collapses to the ground.
Just use your mind and your eyes...that's all you need.