DarkStar presented his measurement using the Eratosthenes triangulation method to prove the globe earth model curvature is right.
My argument on the Eratosthenes triangulation method is that the sunlight is NOT a straight line but a curve due to atmospheric rerfraction, therefore there is no triangle in this case.
The sun is NOT where we see it! Due to atmospheric refraction the observers see an APPARENT SUN in different position  only the one with the sun at 90 degrees overhead sees the REAL SUN.
The sun light is coming into more dense, hot and humid air with more pressure and CO2
therefore the sun light is bent downwards to earth
Please watch this video from 2:48
Source: https://www.youtube.com/watch?v=sj868IzNrk
So the SUN is NOT where we see it  that means that the sunlight is NOT STRAIGHT!
Therefore the triangulation method is WRONG because the "c" side of the triangle is NOT a straight line  ergo there is NO triangle here.
We are looking for the REAL SUN angle to calculate with the triangulation method, but we have to define the amount of bend on the sunlight.
Compare DarkStar's results of the sun triangulation: looks like the power curve is the same as the Atmospheric refraction curve chart
SO if the sunlight triangulation measurements represent the atmospheric refraction power curve, then where is the curvature?
and here is video in the attachment  I don't know the source  that demonstrates the apparent and real sun differences on the globe earth model
The sun is NOT where we see it! Due to atmospheric refraction the observers see an APPARENT SUN in different position  only the one with the sun at 90 degrees overhead sees the REAL SUN.
The sun light is coming into more dense, hot and humid air with more pressure and CO2
therefore the sun light is bent downwards to earth
Please watch this video from 2:48
Source: https://www.youtube.com/watch?v=sj868IzNrk
So the SUN is NOT where we see it  that means that the sunlight is NOT STRAIGHT!
Therefore the triangulation method is WRONG because the "c" side of the triangle is NOT a straight line  ergo there is NO triangle here.
We are looking for the REAL SUN angle to calculate with the triangulation method, but we have to define the amount of bend on the sunlight.
Compare DarkStar's results of the sun triangulation: looks like the power curve is the same as the Atmospheric refraction curve chart
SO if the sunlight triangulation measurements represent the atmospheric refraction power curve, then where is the curvature?
and here is video in the attachment  I don't know the source  that demonstrates the apparent and real sun differences on the globe earth model
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