Dodgy ‘Earth curvature calculators’

Hi all, I have noticed that there are a number of ‘Earth curvature calculators’ that give a misleading figure for how much of something should be obscured. Usually (as per this one: http://earthcurvature.com/ ) they are just not doing a great job of explaining that the calculator is calculating absolute curvature based on distance from the viewer ... Read even more

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