Dear Aimo, Ha! Yes I like your metric version...
1. Take your height above the ground in
meters and multiply by ten
2. Add a half
3. Take the square-root
4. The result is the distance to the
refraction rised horizon
It is spoilt slightly by the instruction
to "multiply by ten". That, of course, is
what the decimal system is all about so I
cannot complain!
Best wishes
Frank
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