[Vaduz]

I know that all that I do know that I know one thing that I know nothing.

Plato

something like that don’t recall it for sure.

dang e

[P.O.E.]

Thanks for taking the time to post this. Food for thought.

[<1/1,000,000th%]

It’s big.

[Flag_This]

"How Big is the Entire Universe?"

It goes to eleven.

[AFPhys]

I am being sidetracked in reading this neat article by the photos, especially the fourth, discussing “curvature”.

I am almost certain that the “curvature” in that photo is caused by “Fisheye Lens Effect”, not “atmospheric distortion”.

In addition, I know that it is nevertheless possible to directly observe Earth’s curvature without going into orbit.

As a pilot, I definitely noted Earth’s curvature (as well as darkening zenith) when flying near 50,000ft, by viewing the horizon.

At lower altitudes in the 30,000 ft range on very clear days, it is amusing to observe “section lines” while flying over the great MidWest of our country. Looking North/South, they appear straight. Looking East/West, they clearly appear “bent” toward the North. This is the case due to their being laid out by compass. Think about it a bit if this effect baffles you; it really is quite interesting demonstration that Earth is curved, even though at those lower altitudes the curvature of the horizon was not noticeable.