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Some of the things you can discover using this page:
How high you need to be to see cliffs (of a known height) over the sea
How far away that cloud is that you can see on the horizon (and you know roughly how high it would be)
How high a space balloon rising 100 kilometres away has to be before you can see it
The difference it makes being on another world (Solid Jupiter is a hypothetical rocky body with the same radius as Jupiter)
It all assumes a clear space between the objects (the sea is ideal for this). Your height is the height of your eyes above sea level. The distance is a straight line distance. At these accuracies, the distance along the curved suface from sea-level to sea-level is pretty much always going to be the same - perhaps 0.002 km different at most.
Have fun.
“Have you seen a horizon lately?” - Yoko Ono