It was beautiful and so we dared to publish it, believing that all those experiments must be wrong. This is one important reason why ugly, complicated theories can often be outdone by what seem to be more beautiful ones. This means that planets were thought to make circular orbits around earth, but that during these circular orbits the planets orbited in smaller circles along the orbits, and along those smaller circular orbits they orbited in still smaller circles, etc. This model was intrinsically very complex because by adjusting the epicycles so that there were a sufficient number of circular orbits within circular orbits at appropriate speeds, one could have described pretty much any shape of orbit, real or imagined. Not only do mathematicians like equations that seem elegant, but it is easier to publish results that strike the reviewers as elegant rather than clumsy and awkward.