[hamdani yusuf]

If 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.

[puppypower]

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?

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.

In other words, if the earth suddenly loss all its mass, but retained all its substance ...

Which is impossible.

..(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.

The spherical body may not change, but the tides and orbits will change unable to follow curved space-time; flat orbits. The point I was making is the theory of the flat earth, was around before they knew of GR. Therefore, GR would not have been one of the variables they could have used. If you factor GR out from all consideration, you also need to factor out the curvature of space-time. I am not saying the earth is flat, only the logic of the old theory would have become limited by lack of this premise. 20/20 hindsight always gives one an advantage.

[Tim the Plumber]

If 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.

Then the pendulum thing would work everywhere. Given it does not work at the equator this idea is out.

[Solium]

Best example ever.  I don't know how to place a hyper link. Replace "x's" with "t's" in "hxxps".

hxxps://www.youtube.com/watch?v=B8QWuSn_Wxw

[Villi (OP)]

Hoping to do my first expedition soon but the weather is incredibly hot and I'll cook under the sun in the couple hours I need to do this.

[Blame]

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-books

LOL.

[Villi (OP)]

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-books

LOL.

A dozen or so books is at least something. But compared to the thousands (or more) on globe earth or based on it?

[Villi (OP)]

I finished the experiment. Here's the video:

Thanks for your support!

I wonder what people think.

EDIT: link not working, maybe this: youtu.be/QwQExaWbzSw

[Villi (OP)]

Okay so my math needs some corrections (I blame you guys lol), I think. According to some other forums, because the buildings are partially visible, the earth is round. I'm going to spend some time soon correcting the math to support the hypothesis that objects disappear under curvature.