Hey all. If you'd like to disprove, easily, in a way that RE-ers will accept, the premise of a round earth, then tomorrow's the day to do it.
On March 20th, 2016 (it's even a weekend, so most people should have the day available) - when the sun is due south of you (or north, for those few in the southern hemisphere), measure the angle to the sun from the vertical.
If the angle is NOT your latitude, then post here (a photo of your setup would probably help), and no Round Earther will be able to refute the proof. Obviously, some indication of your latitude and proof that the sun was due south/north (i.e. probably not exactly at 12:00 noon, depending on your location) when the measurement was taken would be required.
If you miss the day, you can plan ahead and try again on September 22nd.
I look forward to seeing the simple, irrefutable proof that the round-earth model is wrong. Of course, if your measurements do show that the angle is equal to your latitude, then I'd be fascinated to hear about a non-RE model that accounts for the geometry. I'm guessing some sort of atmospheric lensing, distorting the position of the sun?