How did Ole Roemer calculate the speed of light and what were the methods he used in his calculations?

Oh honey, let me spill the tea on Roemer real quick. With his fabulous brain back in the day, Roemer nabbed the speed of light by studying Jupiter's moons – those little suckers move fast. He timed the eclipses of Io using his snazzy telescope, and voila, he had himself a fancy calculation and a spot in the physics hall of fame.