[philman_36]

It's because of the curve that we can only see a limited distance.

Our eyes are why we can only see a limited distance.
Devices like cameras, telescopes and binoculars can extend the range of human eyesight.

When a ship on the ocean drops from view along the horizon, it has not submerged, it is obscured by the curve of the earth.
A ship drops from sight because of the limits of the human eye.
Surely you've experienced the effects of perspective and the vanishing point somewhere at some point in your life.

[philman_36]

It's because of the curve that we can only see a limited distance.

How is it that when you use a pair of binoculars, a zoom camera or a telescope as you see an object "go over the curve" with your naked eye it suddenly comes back into view with the aid of such devices?

Shouldn't the object still be obscured by "the curve"?