Good question! If you have any others, and are interested in some alternative perspectives on them - please join us on flatearthresearch to explore and exchange them!
The density gradient in our air tends to cause light to curve convexly towards the ground. That bending becomes less and less extreme as you increase altitude, because the density decreases as you rise. In addition to this, ultimately that density is responsible for a “fog”/“haze” that prevents you from seeing anything further. Because the density of the air you are looking at is lesser from higher altitudes, the distance to that “fog”/“haze” point (where you can’t see further, because light from distant objects can’t reach you anymore) is also greater. These are the 2 main reasons.
Why is the ship's lookout posted on the top of the mainmast? Why does he see land before the guys on deck?
perspective
Ships Disappear Beyond Earth's Curvature? (4 mins) - https://www.youtube.com/watch?v=BrfFn-nZ3ns
Good question! If you have any others, and are interested in some alternative perspectives on them - please join us on flatearthresearch to explore and exchange them!
The density gradient in our air tends to cause light to curve convexly towards the ground. That bending becomes less and less extreme as you increase altitude, because the density decreases as you rise. In addition to this, ultimately that density is responsible for a “fog”/“haze” that prevents you from seeing anything further. Because the density of the air you are looking at is lesser from higher altitudes, the distance to that “fog”/“haze” point (where you can’t see further, because light from distant objects can’t reach you anymore) is also greater. These are the 2 main reasons.