Later, as the months wear on, a series of additional messages arrive from Gerry -- always delivered in the most remarkable and surprising of ways. With each new message comes a new adventure, and each letter signs off in the same familiar way: P.S. I love you..
For a person standing at sea level, however, the horizon is only about 3 miles away. Lets do the calculations. The figure below shows an observer whose eyes are a distance E above sea level. A straight line drawn from the observers eyes tangent to the seas surface touches it at the distance d1, which is the distance to the horizon. If R is the radius of the earth, then, to first order in E/R, it is easy to show that.
Best Answer: The horizon distance as seen from an elevated position can be calculated by: Dist to horizon = Sq root of, ((radius of earth + hight above ground)^2 - radius of earth^2) http://www.boatsafe.com/tools/horizon.ht... says if you are on Mt Everest, 29006 feet high, unobstructed horizon is at 229 miles. So your figure of 800 miles is a bit high, by about 4 to 10 times. But if this girl's city is quite high also, and the planet this is on is much larger than the Earth (curve of horizon is larger) then 800 miles might be possible.