Hydro-static leveling rig showing a horizon drop that gets more pronounced with altitude. This is consistent with a round Earth. A description of this experiment and the reasoning behind it can be found here: Taken at: Sea Level in Malibu, CA : 34° 2'“N, 118°35'“W 1200 ft in Malibu, CA : 34° 2'“N, 118°37'“W 5600 ft at Mt. Wilson, CA : 34°13'“N, 118° 3'“W
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