Oh, you mean like they also invented the radio Popov راديو in 1873, but lacked electricity to make it work?
They invented the radio in the time of Mohammed but could only use it to hold down the edge of the tent until they invented the transistor that is powered by the Will of Allah.
Actually, pretty much everyone knew the Earth is round from the ancients on up. The Greeks and Egyptians and Sumerians knew that and most of them had calculated a circumference that was reasonably close. Seafaring cultures figured it out pretty early.