Lesson #255: How Far You Can See

I’m visiting my grandmother on the way down to the Mid-Atlantic city I’m moving to and the discussion of how far one can see standing on flat land came up. The average answer is around 3 miles and it’s figured out with this equation:

(r+h)squared = r squared + d squared

Solving for me at 5’7″, that’s…

(3961.301)2 = (3961.3)2 +d2

15691905.612601 = 15691897.69 +d2

7.922601= d2

d = 2.81471

So standing on flat ground at no elevation, I can see about 2.8 miles.

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