Does anyone think, that a telescope could be used to look across an ocean at
night, to see if there's daylight on the other side, would it work ?
I would try it, if I had the money and lived close to an ocean.
If you think it might work, please let me know. Thanks John
If the Earth was flat we would still have two options, depending on reasons why we have night on Flat model.
One option would be that sunlight has limited range, so in that case if we don't see direct light, we also can't see reflected light.
Reflected light always has longer path from sorce to observer than direct path.
Another option would be if the Sun has "lamp shade", shade cone that makes it spotlight.
In that case we would be able to see reflected light.
In that case we would at night be able to see daylight across the ocean through telescope.