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The distance visible to the horizon from different heights

Due to the Earth being round, its convexity limits the distance visible. This chart gives the distance to the horizon visible from different heights. The line of vision of a person of six feet in height for example would be 3.24 miles, whereas a pigeon flying at an altitude of 1 mile would command a view of 96.10 miles in every direction. If you were looking at a distant object of 44 feet in height, such as a flag on a masthead, then the flag would seem to be on the horizon if it were 9.35 miles distant. In this case you would add the height of the flag to the height of your eye from the ground (44' + 6' = 50 feet).
 

    Height (ft)          Height (m)       Distance (miles)      Distance (km)  
1 0.30 1.31 2.09
2 0.57 1.87 3.00
3 0.67 2.29 3.68
5 1.52 2.96 4.83
6 0.98 3.24 5.21
10 3.05 4.18 6.76
15 4.57 5.12 8.21
20 6.10 5.92 9.50
25 7.62 6.61 10.62
30 9.14 7.25 11.75
40 12.19 8.37 13.52
50 15.24 9.35 15.13
65 19.81 10.25 16.58
70 21.34 11.07 17.86
80 24.38 11.83 18.99
90 27.43 12.25 19.79
100 30.48 12.23 19.63
150 45.72 16.22 26.07
200 60.96 18.72 30.09
300 91.44 22.91 36.85
400 121.92 26.46 42.65
500 152.40 29.58 47.64
1000 304.80 32.41 52.14
2000 609.60 59.20 95.27
3000 914.40 72.50 116.68
4000 1219.20 83.70 134.70
5000 1524.00 93.50 150.47
1 mile 1609.00 96.10 154.66