Sphere over Orlando, FL 07.11.15.Spherical craft seemed to rise up from the approximate coordinate 28.569478, -81.307457 and pass due south over 28.539585, -81.305258. It traveled at a high rate of speed (from just above "horizon" to past and beyond the buildings to south in 15 or so seconds). It could have been traveling up and then went south or might have been further away and seem to be rising first. I estimate that is 3.5 miles in 15 seconds or 840mph. It also preceded a southward moving storm and traveling in the center of the airport landing flight paths.The object had no details or irregularities--just a plain sphere. I thought it might be the bulb of a helicopter at first, but it flew directly above me in clear sky and had no tail or rotor. It started white (almost bright as it seemed to be ascending) and turned grey as it passed overhead, like moving to the shadow side of a sphere but the sun was west and low at 6:30pm.I didn't have my camera ready (doh!) and my wife dismissed it as a helicopter at range and then walked away. Ultimately it is only my witness testimony…