but the slope is steep (do you really know it or are you just repeating what NdGT said? From 30,000 feet, you can see about 200 hundred miles, and the drop over that distance is....26,657.7237 feet thats room for a huge mountain of curvature to notice.

So, yes, it is established that you would notice from 30,000 feet, because you could see a drop off of miles.

Using your own numbers:

If we are 30,000 above sea level looking out 200 miles where the horizon line meets the earth, and the drop-off is 26,657 feet, then the horizon line will be about 3 degrees below eye level.

arcsin(56657 / (200 * 5280)) = 3.257 degrees

Nobody looking out a plane window would be able to say whether the horizon line is at eye level or 3 degrees too low. If I recall the drop-off is actually less than this - I'm simply using the numbers you gave me.

no, you heard this and you repeated it. thats all

Funny how I get this same response regardless of whether I'm speaking to a fellow questioner or anybody else.

but the slope is steep (do you really know it or are you just repeating what NdGT said? From 30,000 feet, you can see about 200 hundred miles, and the drop over that distance is....26,657.7237 feet thats room for a huge mountain of curvature to notice.

So, yes, it is established that you would notice from 30,000 feet, because you could see a drop off of miles.

Using your own numbers:

If we are 30,000 above sea level looking out 200 miles where the horizon line meets the earth, and the drop-off is 26,657 feet, then the horizon line will be about 3 degrees below eye level.

arcsin(56657 / (200 * 5280)) = 3.257 degrees

Nobody looking out a plane window would be able to say whether the horizon line is at eye level or 3 degrees too low. If I recall the drop-off is actually less than this if I recall - I'm simply using the numbers you gave me.

no, you heard this and you repeated it. thats all

Funny how I get this same response regardless of whether I'm speaking to a fellow questioner or anybody else.