We live inside on the inside surface of a spheroid. Not on the outside surface of a sphere. I don't have anything with which to back that claim up though.
There are many websites devoted to this theory.
The best so far, in my short trek into this topic is:
http://www.wildheretic.com/If you're not familiar with Concave Earth Theory, check out the presentation at that site.
And this may explain all of conspiracy-land. From the sounds coming from the sky to the supposed secret bases at the Antarctic to ufos to the Moon being "out of place" as reported in various threads around the internet, and everything in between. Especially chemtrails.
The Holy Grail of it all, as it were.
Or more appropriately: "The Grand Unified Theory of Conspiracy Theories"
Sorry for the minimal post.
One could spend a lifetime investigating this. And I just started. So that's all I have.