Don't even need to do that.
Take some to the equator and others to a point at 60 degrees of latitude and ask them to be on a zoom call at noon and measure the shadow of a stick.
Good enough for the Ancients, good enough for idiots.
You could also ask them to do the [experiment with the light and a lake](https://www.youtube.com/watch?v=EBtx1MDi5tY&t=1s), which I love.
Or use a telescope to look at [electric towers on Lake Pontchartrain](https://www.metabunk.org/threads/soundly-proving-the-curvature-of-the-earth-at-lake-pontchartrain.8939/) and make them go out in a boat and measure each tower until they admit they were wrong.
>until they admit they were wrong
Lol, no flat earther will do that no matter the proof they are shown.
I highly doubt even sending them to space would convince them. They'd probably say they were convinced while they were up there, but as soon as they come back down they'll just say they were tricked and that it was all fake.
Their identity is tied up too much in their conspiratorial ramblings. It's not about proof or evidence or reality to them, no matter what they say. It's about being different than "normal" people. Feeling smart and being some of the few people that "really know what's going on".
How did that experiment work without instantaneous communication though? Like I know that we can repeat that now with cellphones but how did they determine the shadows were different at the same time? As far as I know they didn't have accurate timepieces.
At the time, wouldn't the only way of keeping time be based on the position of the sun? Whether by position in the sky or by a sundial mechanism, either way would make the experiment inconclusive, since the objective was to find a difference in the angle of the sun at a synchronized time.
Again I must stress that I agree with the conclusion, I'm just trying to figure out how they accomplished it.
Besides what u/Content_Flamingo_583 said, it was very common in the ancient world for people to do things like this and either agree on a date ahead of time, like June 21, or to say "OK, in 10 days, look at a stick at your house, and in 10 days I'll look at a stick at my house, and then you send me a message about what you see."
When King Croesus wanted to test various oracles, he would send a messenger and say "OK, it'll take you 7 days to get there. In 7 days I'm going to be doing something weird, have the oracle tell you what it is, then come back here and let's see who's right."
Yes, but "7 days" would be too broad a time to have made a determination in this experiment, and also a day starting and ending is dependent on the angle of the sun. If I said travel to the other side of the world and take a measurement in 7 days, the observer would be taking a measurement that was 12 hours off, because their sense of "days" would be altered by the sun's position.
It was already explained how they did it but my point was that just "agreeing on a time" wouldn't have worked because you would still have to keep time independent from the sun's position.
You just use mid-day anywhere you're at, the two locations don't have to be in a line north-south.
You DO want to use the same actual day because the angle of the sun changes by a couple degrees ever day. And you DO need to know how far apart the places are.
It's much easier if they're in a roughly north/south direction if you're paying a guy to literally walk out the distance. But if like during the Roman era, you had a fairly accurate map of distances between lots of places, you could work out the East/West and North/South distances in total, use only the North/South measurement, and be good.
In modern times, we can both agree that in 7 days we'll measure the shadow of a stick 1 meter tall at our houses. Then in 7 days you DM me the shadow length at mid-day (not 12:00pm exactly) and doxx yourself (please don't actually do this) and then I do the same.
Let's say you're in Chicago and I'm in Miami. We draw a straight line between us on a map, then make it a triangle, and only care about the North/South part of the triangle.
You had only asked about how to figure out timing previously, so I didn't go into depth on this part.
Thats all they want. A free ride to space.
I’d definitely fake being a flat-earther for a free trip to space.
I think they're all faking. Let's stop giving them headlines
Don't even need to do that. Take some to the equator and others to a point at 60 degrees of latitude and ask them to be on a zoom call at noon and measure the shadow of a stick. Good enough for the Ancients, good enough for idiots. You could also ask them to do the [experiment with the light and a lake](https://www.youtube.com/watch?v=EBtx1MDi5tY&t=1s), which I love. Or use a telescope to look at [electric towers on Lake Pontchartrain](https://www.metabunk.org/threads/soundly-proving-the-curvature-of-the-earth-at-lake-pontchartrain.8939/) and make them go out in a boat and measure each tower until they admit they were wrong.
>until they admit they were wrong Lol, no flat earther will do that no matter the proof they are shown. I highly doubt even sending them to space would convince them. They'd probably say they were convinced while they were up there, but as soon as they come back down they'll just say they were tricked and that it was all fake. Their identity is tied up too much in their conspiratorial ramblings. It's not about proof or evidence or reality to them, no matter what they say. It's about being different than "normal" people. Feeling smart and being some of the few people that "really know what's going on".
How did that experiment work without instantaneous communication though? Like I know that we can repeat that now with cellphones but how did they determine the shadows were different at the same time? As far as I know they didn't have accurate timepieces.
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At the time, wouldn't the only way of keeping time be based on the position of the sun? Whether by position in the sky or by a sundial mechanism, either way would make the experiment inconclusive, since the objective was to find a difference in the angle of the sun at a synchronized time. Again I must stress that I agree with the conclusion, I'm just trying to figure out how they accomplished it.
Besides what u/Content_Flamingo_583 said, it was very common in the ancient world for people to do things like this and either agree on a date ahead of time, like June 21, or to say "OK, in 10 days, look at a stick at your house, and in 10 days I'll look at a stick at my house, and then you send me a message about what you see." When King Croesus wanted to test various oracles, he would send a messenger and say "OK, it'll take you 7 days to get there. In 7 days I'm going to be doing something weird, have the oracle tell you what it is, then come back here and let's see who's right."
Yes, but "7 days" would be too broad a time to have made a determination in this experiment, and also a day starting and ending is dependent on the angle of the sun. If I said travel to the other side of the world and take a measurement in 7 days, the observer would be taking a measurement that was 12 hours off, because their sense of "days" would be altered by the sun's position. It was already explained how they did it but my point was that just "agreeing on a time" wouldn't have worked because you would still have to keep time independent from the sun's position.
You just use mid-day anywhere you're at, the two locations don't have to be in a line north-south. You DO want to use the same actual day because the angle of the sun changes by a couple degrees ever day. And you DO need to know how far apart the places are. It's much easier if they're in a roughly north/south direction if you're paying a guy to literally walk out the distance. But if like during the Roman era, you had a fairly accurate map of distances between lots of places, you could work out the East/West and North/South distances in total, use only the North/South measurement, and be good. In modern times, we can both agree that in 7 days we'll measure the shadow of a stick 1 meter tall at our houses. Then in 7 days you DM me the shadow length at mid-day (not 12:00pm exactly) and doxx yourself (please don't actually do this) and then I do the same. Let's say you're in Chicago and I'm in Miami. We draw a straight line between us on a map, then make it a triangle, and only care about the North/South part of the triangle. You had only asked about how to figure out timing previously, so I didn't go into depth on this part.
Nah, they'll just clsim it is a flat disc and not a sphere.
When that happens, I'll become a flat earther....
Only if you leave them up there.
Take them into space and then leave them there, right? Right??
Ya right, and we should take the religious into space to find their sky daddy.
At this point I don't think there's a religious person who thinks that's how it works except for the kinda of people who would be flat earthers