Originally posted by Ernst
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All of them can be due to other reasons.
You need to admit that you simply prefer to believe in round Earth than flat Earth, not that the evidence is overwhelming. As I said, you haven't witnessed/checked any of it first-hand to be absolutely sure.
As for your 'arguments' how would you determine that the 10000 km line was straight? How would you know you are making a 90 degrees turn? What will be your reference point? If it is the stars or the compass, sorry but those might be misleading.
As for atmospheric refraction, YES, it is connected to what I said; refraction it is very tighly connected to air density. Please read the link I gave you more carefully. (This refraction is due to the velocity of light through air decreasing (the index of refraction increases) with increased density.
it at least once a day.
or... from right to left...
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