DETERMINE LINEAR AND ANGULAR DISTANCE FROM HORIZON FOR A GIVEN HEIGHT OR ELEVATION
LARGE NUMBERS CAN BE ENTERED IN EXPONENTIAL FORM. EG: 2000000000 = 2.0E+09 OR 2300000000 = 2.3E+09
HOMEPAGE

HEIGHT OR ELEVATION ABOVE SEA LEVEL IN ***METRES***
RADIUS OF SPHERE IN ***METRES***. FOR THE EARTH = 6366197.72367 Metres = 6366.19772368 Kilometres, corresponding to a CIRCUMFERENCE of exactly 40000 Kilometres. See HERE for more information.