Offline jojo

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The experimental principle is based on a sphere, which is different from a plane。
1:Assuming that the earth is round, we select the latitude and longitude of the equator on the globe. According to this mark, we go to the corresponding place to put down the eye-catching sign, and then use the drone to observe. If the sign is a straight line, it means the earth is round, otherwise it is flat.
2:We all know about the Japanese nuclear radiation leak。
We can take advantage of these trajectories of nuclear radiation. If the earth is round, these nuclear radiation trajectories will continue to circulate and the concentration will continue to increase. If the nuclear radiation trajectories continue to spread to the outside and the concentration weakens, it means that the radiation flows to the outside, and the earth has boundaries!

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Offline Tumeni

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we select the latitude and longitude of the equator on the globe. According to this mark, we go to the corresponding place to put down the eye-catching sign, and then use the drone to observe. If the sign is a straight line, it means the earth is round, otherwise it is flat.

The equator of the Earth, or any sphere, is not defined by a combination of latitude and longitude. It is a longitudinal line which does not deviate in latitude.

It is not a "mark"

You may want to rethink.
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Not Flat. Happy to prove this, if you ask me.
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Nearly all flat earthers agree the earth is not a globe.

Nearly?