As I understand it, this is how (good) science works:
First you make some observations. Then you develop a theory to explain your observations. Then you make a model based on your theory. Then you and - more importantly - other people make some more observations.
If the new observations are explained adequately by (i.e. "fit") the model then the model stands. If the new observations are *not* explained adequately by (i.e. "do not fit") the model then the model falls.
In The Flat Earth debate there are two main models (as far as I can tell):
1. The earth is flat; The Sun and Moon circle overhead; "gravity" is caused by The Universal Accelaration; light bends due to "the aether" (explaining sunrise/sunset).
2. The Earth is round; The Earth is in orbit around The Sun and The Moon is in orbit around The Earth; gravity is a 'force' caused by the mass of The Earth (Newton or Einstein/GR); there is no "aether" and light travels in straight lines (ignoring extremely massive objects like black holes and galaxies!).
Now the Round Earth Model is *very* widely accepted but that is no real proof that it is true (argument ad populum, as the Romans used to say, is false).
So I would like to invite people to come up with observations which "do not fit" the Round Earth Model.
In this way we can test this popular thoery in a rigorous scientific fashion (which should be fun!).
At the moment I am not interested in testing the Flat Earth Model, but somebody else can start a thread for that one if they want to.
Many thanks!
[Edit: tidy up formatting]