There is formula given by G.T. McCaw
where, h1= elevation of station !
h2 = elevation of station B
h= elevation between intervening station C
2S = distance between stations A and B
s+d = distance of C from A
s-d = distance of C from B
z = zenith distance from A and B
h2 = elevation of station B
h= elevation between intervening station C
2S = distance between stations A and B
s+d = distance of C from A
s-d = distance of C from B
z = zenith distance from A and B
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