Mathematical Challenge | Page 2 | INFJ Forum

Mathematical Challenge

do the eyes have to be discernible, or are you just asking what's the greatest distance the they wouldn't be blocked by the earth
 
assuming that discerniblity doesn't matter, and ignroing the inconsistent radius of the Earth (and because I don't don't know average radius of the earth in feet).

r=>radius of the earth in feet

d=2sqrt(10r+25) ft
 
I am satisfied someone looked at the human element of the problem.
Our abilities, and sometimes even what we use to enhance our abilities, change the answer to the question. A+ for you.