You are standing on a beach looking out into the ocean. Assuming your view is unobstructed, how far can you see?
A small practical i.e. (approximated) contribution (metric):
D=3.6*SQRT(H)
Distance in km, Height in m
e.g. from a tower of 100m you see about 36 km
Height of yourv eyes"
Want to add 1.7 m? Will not change too much.