…concluded that they all went around, along with the Earth, went around the sun. This discovery was later made independently by Copernicus if they had forgotten, if people had forgotten that it had already been made. Now the next thing, question that came…

…some other kind of a curve? How fast do they move and so on? And this discovery took a long to make. Times after Copernicus were times in which there were great debates about whether the planets in fact went around the Sun along with the Earth or…