[stormhill]

Probably is but I’ve met some who sincerely believe it. The problem is that there’s no evidence you can present them that isn’t a government trick. As a thought experiment I tried to come up with irrefutable proof the world is round.

Year before last, I flew from New Jersey to Malaysia. The entire flight, the horizon appeared as a curve. Now, I understand that does not in itself prove a round Earth; this does: the curvature remained the same the entire trip!
You see, if the planet is a pancake, from the air it would look round, oval or straight depending on the angle you’re seeing it from whether straight down, oblique or on edge respectively but since the shape of the horizon didn’t change it has to be spherical because only a sphere maintains a constant curvature regardless of what angle you view it from.

[who_would_fardels_bear]

I think you can make a pretty good case using star trails.

If you can get star trail pictures from different points on the Earth then the only explanation of what is being seen is that the photos are taken from a globular Earth.

It's a little convoluted, but convincing if you draw a circle, put two dots on it and think how would we see the circular paths we see from different points on the Earth if it were flat.

[DuncanWaring]

As a thought experiment I tried to come up with irrefutable proof the world is round.

How about the fact that it casts a curved-edge shadow during lunar eclipses?

How about the fact that the North Star distance above the horizon depends on how far from the equator you are?

Use the Altitude of Polaris to Find Latitude.

[Moonman62]

Probably is but I’ve met some who sincerely believe it. The problem is that there’s no evidence you can present them that isn’t a government trick.

...

https://en.wikipedia.org/wiki/Confirmation_bias

[2harddrive]

“Probably is but I’ve met some who sincerely believe it. The problem is that there’s no evidence you can present them that isn’t a government trick. As a thought experiment I tried to come up with irrefutable proof the world is round.
Year before last, I flew from New Jersey to Malaysia. The entire flight, the horizon appeared as a curve. Now, I understand that does not in itself prove a round Earth; this does: the curvature remained the same the entire trip!
You see, if the planet is a pancake, from the air it would look round, oval or straight depending on the angle you’re seeing it from whether straight down, oblique or on edge respectively but since the shape of the horizon didn’t change it has to be spherical because only a sphere maintains a constant curvature regardless of what angle you view it from.”

CORRECT, Mr. Stormhill. Thank you for posting that.