As a scuba diver looking through clear water in grand cayman I can see about 200 to 300 feet before everything is too opaque. I swim 300’ over and see that was not the end of the world because I can still see another 300’. Air has less water vapor so we can see 100s of miles. Long past the theoretical 0.666 feet of drop per mile squared. I drive the same stretch of flat highway and sometimes I can’t see the car in front through the fog or haze but I know the road didn’t arc to cause that. It’s just water in the air. Just like Genesis 1 describes. The hard glass like firmament separated the waters of outer space from the waters of our atmosphere

As a scuba diver looking through clear water in grand cayman I can see about 200 to 300 feet before everything is too opaque. I swim 300’ over and see that was not the end of the world because I can still see another 300’. Air has less water vapor so we can see 100s of miles. Long past the theoretical 0.666 feet of drop per mile squared.