How high is the airplane's pilot to see 0.001 of Earth's surface?

Correct result:

h =  12.7816 km


R=6378 km S1=4π R2=4 3.1416 63782511185932.5225 km2 S=0.001 S1=0.001 511185932.5225511185.9325 km2  S=2πRv v=S/(2π R)=511185.9325/(2 3.1416 6378)=3189250=12.756 km y=Rv=637812.756=6365.244 km x=R2y2=637826365.2442403.1784 km  x/y=(h+v)/x h+v=x2/y h=x2/yv=403.17842/6365.24412.756=6378499=12.7816 km

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