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“Visual daytime observations show that the minimum altitude at which curvature of the horizon can be detected is at or slightly below 35,000 ft, …Photographs pu
by raldi 2y ago
“Visual daytime observations show that the minimum altitude at which curvature of the horizon can be detected is at or slightly below 35,000 ft, …Photographs purporting to show the curvature of the Earth are always suspect because virtually all camera lenses project an image that suffers from barrel distortion”
https://opg.optica.org/ao/abstract.cfm?uri=ao-47-34-H39 https://opg.optica.org/ao/abstract.cfm?uri=ao-47-34-H39
Another trick you can do: take this Concorde photo and use the rules of geometry to draw the rest of the circle, and look how small an Earth you’ve drawn.
- saagarjha 2y agoConcorde flies higher than 35000 feet.