Johannes Hevelius drew the constellation Draco the Dragon in Uranographia, his celestial catalog, in 1690. He plotted the sky in reverse, as if seen from above, facing down toward Earth. Note the circle around the Dragon and the star where the Dragon’s Tail intersects the circle. That star is Thuban, a former pole star. Image via Wikimedia Commons. Don’t miss the next unmissable night sky event. Sign up to EarthSky’s free newsletter for daily ni…