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For some reason few people on both sides of the FE issue talk about this. How many ships have sailed between the continents in the last 500 years? Just one trivial example: The clipper ships. When there was a premium for the first new crop of tea from China, the clippers took this route...

The DFDS ro/ro-vessel Ficaria Seaways passes Skagen [Denmark] on route from Immingham to Gothenburg :http://c8.alamy.com/comp/FCPGC3/the-dfds-roro-vessel-ficaria-seaways-passes-skagen-on-route-from-immingham-FCPGC3.jpg Looks as if it would be useful to note whether any of the red paint on the...

It's simply a matter of scale. As a matter of fact I addressed this very subject two years ago. This is Hurricane Delores off the coast of Baja California in this Aug. 2015 version (the earliest)...

The holes at the poles thing goes way back. This is a cover from Flying Saucers Magazine - June 1970 The idea of the holes at the poles did not originate at this time with these photos; these photos were triumphantly put forth by the publisher and editor - the infamous Ray Palmer - as proof...

Phil Dick's Galactic Pot Healer is a particularly good choice.

Let's make it clear that graphical perspective is a technique developed by artists to make their paintings and drawings look more realistic. The vanishing point is a part of this technique. The vanishing point theorem is a mathematical abstraction. In graphical perspective, a vanishing point...

For one thing it wouldn't fly upward very long without enough thrust. It would run out of energy and stall. Then it would pick up speed in the dive and level out. How much experience have you had with model airplanes? Balsa wood gliders were a big thing when I was a kid in the '60's. I...

Edit: I'm just seeing that I'm restating some things that have already been said. I'm not sure this is valid, but aircraft have a center of gravity (which must be carefully calculated when loading). Thought experiment: Walk around a perfectly spherical planet holding a plumb bob. The plumb...

There's a reply to your video. You used a reflective teapot under the open sky. He boils water in a non-reflective teapot inside a van, and uses his IR thermometer gun in two ways: On the reflection of the teapot in a mirror and on the surface of the teapot. The reflection temp is measured...

I was wondering if the flat earth billboard pics that have been showing up recently were CGI fakes (lol), but apparently it is real. I think this is near the Philadelphia Airport. Reporter:"Math Powerland" purchased the ad. Math Powerland: ...nine hundred bucks for that one. Reporter: He's a...

One also has to ask what the gravimeters used by mining engineers and so on are actually measuring. https://en.wikipedia.org/wiki/Gravimeter A gravimeter is a type of accelerometer, specialized for measuring the constant downward acceleration of gravity, which varies by about 0.5% over the...

The first to measure a difference in the strength of the earth's gravitational field due to location was Jean Richer during an expedition to French Guiana in 1671-1673. He found that his seconds pendulum didn't keep proper time (as measured against the stars). It lost 2m 28s per 24 hours. He...

It seems to me each molecule would follow a ballistic trajectory.

I'm certainly not going to pick a fight with you on this, and I'm grateful to the OP for taking the time to make a formal explanation, as my math is not only weak it's non-existent. I propose that there be differing levels of explanation; basic, intermediate and advanced. With the target...

If light can bend any which way you want it to on an ad hoc basis, then the whole, "Nobody has seen the curve" argument falls apart. It could bend to make a sphere look flat, or indeed as the hollow earthers affirm, a concave surface look convex.

That's another example of how using nothing but intuitive thought will get you into trouble. They're mixing two different issues together without realizing it. If the sun were like a spotlight - the light only travels downward, not in all directions - we would see it disappear while still high...

From that same thread I linked to, in the above post: The arguments put forward by analytical people are often far too technical to help. The people who can understand them already do understand. The hard core FE believer is not the target audience, but as we've seen here on this MB there...

The flat earth sunset is based on intuition not on analysis. Things appear lower in the sky, and closer to the horizon, the farther away they are. So far so good. But this is where they get into trouble. They intuitively assume that this process will continue indefinitely and as a simple...

https://science.nasa.gov/science-news/science-at-nasa/2001/ast02aug_1 On Earth, blood pools in the feet. When people stand, the blood pressure in their feet can be high -- about 200 mmHg (millimeters of mercury). In the brain, though, it's only 60 to 80 mmHg. In space, where the familiar pull...

I downloaded this GIF. Look at the thunderstorms over north Texas, Oklahoma, etc.