Copernicus deduced the sun was at the center of our solar system after Leonardo DaVinci surmised the same thing. Da Vinci's genius was tempered by procrastination. He never took the time to publish his findings. From the evidence of the notebooks that survive, if even a fraction of Da Vinci's discoveries or insights had made it into the public domain when he was alive, science could have been advanced by an era (i.e., imagine if we had next century's technology today). It was he who first surmised that "The earth is not in the centre of the Sun's orbit nor at the centre of the universe."