Actually, that would just make people think it's circular. Even then, a square object casting a shadow on a spherical object produces a shadow that is almost circular as well. We know it's round because of a primitive version of the scientific method utilized.<quoted text>
The earth is round because we can see the reflection of its shape on the moon during a lunar eclispe. This is as true today as it was when Ferdinand Magellan first took notice. And gravity? Well - its currently undergoing scientific reconstruction as do all of science's "theories" eventually. Why should anyone accept science's theories as truthworthy when they change all the time?
Because the theory is being refined doesn't make gravity go away either, does it?