But if the earth were flat, the angle between the north star, Polaris, and the horizon, would always be the same, regardless of latitude.
Not at all.
mw is correct. Why is everyone in this thread so bad at geometry? It is trivial to show the curvature of the earth with basic geometry. The greeks did it over 2000 years ago.
There is no curvature to the earth.

Those are all panoramic shots, and by their nature, would not exhibit any curve.
Panoramic shots are designed to work in this way, so these shots in and of themselves do not prove a flat earth, nor do they disprove a globe earth.
If you are going to claim that NASA's photos of the globe earth are fake, then you cannot use photos that have been stitched together by computer software to claim the earth is flat.
That is illogical.
Ok, do show, anything at all, that proves curve commensurate with a 24,000 mile ball. Your own personal tests, someone else's tests, photos, whatever. Please only untouched, non cgi, not photoshopped evidence. But I'll take anything at all.
Just to save you time and effort if you were to try, let me admit to you that no one to date has produced this evidence and I've been doing flat earth for almost 10 years now. Why? Because they know it doesn't exist. NASA provides glorious photoshops of all sorts of things in outer space, yet not one true video of the rotating earth. Seriously? Not one single photo of the ball earth. NOT ONE!!! BY NASA'S OWN ADMISSION! So, please explain to me where is your evidence that earth is a ball?
Let me guess, you think earth is a ball...
1. Because NASA says so.
2. Because somebody says a shadow on the moon is curved.
3. Because teachers said so.
4. Because somebody said that flat earth is stupid.
5. Because everybody else says its true.
6. Because somebody says that the stars and sun and moon wouldn't work on flat earth.
7. Because somebody said ships disappear over the horizon.
8. Because somebody said astronauts saw it.
Wow. 100% of heliocentrism theory held by individuals is unsubstantiated, undocuмented, unphotographed, untenable HEARSAY! I really want to understand why good Catholics maintain heliocentric theory, when the Catholic Church condemned heliocentrism? Scripture only describes a flat immovable earth. Church Fathers condemned heliocentric theory, including sphericity of earth, based on scripture, yet Catholics still have the nerve to hold this blatantly condemned proposition.
Maybe you could explain that to me. I really don't get it. What are people holding on to?