If you are looking at the horizon, you can determine the distance you are from the horizon in miles, D, from a height, h, in feet by the equation of D = . If you are standing on a mountain top that is 12,000 feet in elevation, how far are you from the horizon?
You did not state the equation that you should use.
Since you are not using metric units, I would have to look up the non-metric formula.
I will let you do that.
posted by Reiny