Strange organism found in vaccines
(nhjournal.com)
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It is impossible to see the horizontal curvature of the sphere whilst standing on its surface. The only curvature you may be aware of at extreme heights would be a gently slope AWAY from you.
The horizontal curvature will be impossible to observe due to the fact that the horizon will appear to be at the same height in EVERY direction and will be observed to resemble a straight line. Straighter then a rule.
If the horizontal horizon is curved then the horizon must appear to be at a much different heights in different directions.
You witnessed an illusion.