I know this may be difficult to believe but there was a time when everyone didn't have a powerful computer in their hands at all times. So complex equations were often simplified. One that I liked to use was Lagrange multipliers. In this paper they simplified equations by setting the radius of the earth to infinity. Of course that was wrong but the errors were small enough that it was still useful. I assume you don't actually believe the radius of the earth is infinity as stated in the paper.

Now in some cases the errors are too big to simplify things. An example is the many videos you post of people measuring the distance they can see without any consideration of the atmosphere. We know the refraction of light can be so great that it can actually cause us to see the sun for several minutes after it has set on some days.

If you actually want to measure the curve of the earth you should either model, calculate and test the refraction or minimize it until it is negligible. One way to minimize it would be to measure the tops of two buildings or mountains of the same height in a place like Denver. Then also measure the altitude of a third point halfway between the first two points. That would take a very precise altimeter or trust in the existing land plots.

I don't think it's valid to use GPS because the satellites have the curve of the earth hard coded into their software when they return position. Also those results can be off by up to 15 meters.

Do you know of any flat earth experiments at altitude as I described?

I know this may be difficult to believe but there was a time when everyone didn't have a powerful computer in their hands at all times. So complex equations were often simplified. One that I liked to use was Lagrange multipliers. In this paper they simplified equations by setting the radius of the earth to infinity. Of course that was wrong but the errors were small enough that it was still useful. I assume you don't actually believe tge radius of the earth is infinity as stated in the paper.

Now in some cases the errors are too big to simplify things. An example is the many videos you post of people measuring the distance they can see without any consideration of the atmosphere. We know the refraction of light can be so great that it can actually cause us to see the sun for several minutes after it has set on some days.

If you actually want to measure the curve of the earth you should either model, calculate and test the refraction or minimize it until it is negligible. One way to minimize it would be to measure the tops of two buildings or mountains of the same height in a place like Denver. Then also measure the altitude of a third point halfway between the first two points. That would take a very precise altimeter or trust in the existing land plots.

I don't think it's valid to use GPS because the satellites have the curve of the earth hard coded into their software when they return position. Also those results can be off by up to 15 meters.

Do you know of any flat earth experiments at altitude as I described?