You can see only so far before the curve of the earth's surface blocks the view of distant objects. Atmospheric refraction, in which the air bends light's path, extends that range slightly. But the atmosphere and distance diminish the view, as light spreads out and dims.

Enter these values (leave them at the default if you're unsure) and click How Far Can I See?

I'm entering values in:   feet meters
Your height:  
Your elevation (above sea level):  
How tall is the object you're viewing?  
The object's elevation:  
The object's name:  
What do you call this thing? e.g. a light, tree, tower, etc.
       

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