APPARENT HORIZON
The table lists the distance of the apparent horizon measured along the curved surface of the Earth.
I suppose the Earth's globe spherical and I neglected the effect of the atmospheric refraction.
H D
Heigt of Distance
the observer
(m) (km)
1 3.569
2 5.047
3 6.181
4 7.137
5 7.98
6 8.741
7 9.442
8 10.093
9 10.706
10 11.285
11 11.836
12 12.362
13 12.867
14 13.352
15 13.821
16 14.274
17 14.714
18 15.14
19 15.555
20 15.959
21 16.353
22 16.738
23 17.114
24 17.482
25 17.843
26 18.196
27 18.543
28 18.883
29 19.217
30 19.546
31 19.869
32 20.187
33 20.5
34 20.808
35 21.112
36 21.411
37 21.707
38 21.998
39 22.286
40 22.57
41 22.85
42 23.127
43 23.401
44 23.671
45 23.939
46 24.203
47 24.465
48 24.724
49 24.98
50 25.234
51 25.485
52 25.733
53 25.98
54 26.224
55 26.465
56 26.705
57 26.942
58 27.177
59 27.411
60 27.642
61 27.871
62 28.099
63 28.325
64 28.549
65 28.771
66 28.991
67 29.21
68 29.427
69 29.643
70 29.857
71 30.069
72 30.28
73 30.49
74 30.698
75 30.905
76 31.11
77 31.314
78 31.517
79 31.718
80 31.918
81 32.117
82 32.315
83 32.511
84 32.706
85 32.901
86 33.094
87 33.285
88 33.476
89 33.666
90 33.854
91 34.042
92 34.228
93 34.414
94 34.599
95 34.782
96 34.965
97 35.146
98 35.327
99 35.507
100 35.686
200 50.467
300 61.809
400 71.370
500 79.793
600 87.409
700 94.412
800 100.93
900 107.051
1000 112.841
1200 123.61
1400 133.512
1600 142.729
1800 151.384
2000 159.571
2500 178.4
3000 195.421
3500 211.072
4000 225.638
4500 239.318
5000 252.255
6000 276.313
7000 298.433
8000 319.017
9000 338.347
10000 356.625