2006-10-09 05:26:26 · 5 answers · asked by land.zero 1 in Science & Mathematics ➔ Earth Sciences & Geology
The approximate geometrical formula is D = 0.85 x sqrt(H) where H is in feet and D is in miles. This is about 2.1 miles for 6 feet, and 1.9 miles for 5 feet.
However, if what you are looking at is already above sea level, you have to add the distances for the two heights. A person in a rowing boat might have his head 2 feet above the water, which gives 1.2 miles, so from a six-foot-high observing point you could see him 3.3 miles away. A lighthouse 80 feet high can be seen from a ship's bridge 40 feet high at a distance of about 13 miles.
2006-10-09 09:23:08 · answer #1 · answered by Anonymous · 0⤊ 0⤋
i dont know for sure.
i thought i heard that at sea you can see 3 miles
thats a good question about height, though
2006-10-09 12:30:47 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Remember to include the height of whatever you are standing on.
2006-10-09 12:47:28 · answer #3 · answered by thylawyer 7 · 0⤊ 0⤋
a person with 20 20 vision can see roughly 4.8 miles
2006-10-09 12:34:02 · answer #4 · answered by logan 1 · 0⤊ 0⤋
about 7 miles. but the other sum based on that i cant be bothered working out,
2006-10-09 12:30:47 · answer #5 · answered by idjit27 2 · 0⤊ 0⤋