In the summer of 1901, a mysterious contraption was discovered in a shipwreck off the Greek island of Antikythera. The object has often been considered to have been the world's first known analogue computer. This baffling mechanism was allegedly used to predict astronomical positions and eclipses. Inspired by the genius of the ancient Greek astronomers, this puzzle challenges you to turn the dials until all 12 columns add up to 42.