You can observe curvature on any 1 mile long straight "flat" (rail)road. Just get your camera at ground level and zoom in on that ruler you put in the ground 1 mile away and see how many inch/centimeter fall behind the horizon.
You can observe curvature on any 1 mile long straight "flat" (rail)road. Just get your camera at ground level and zoom in on that ruler you put in the ground 1 mile away and see how many inch/centimeter fall behind the horizon.
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