E1EWK3SY2-DHLATYPWU28RU1PSTILK 1514 1530 1559 1598 1618 1656 1675 1664 1675 1714 1737 1741 1759 1760 1770 Moons of Jupiter Motion of Moon Chronometer 0 4 6 14 0 3 0 1 floating bar history of longitude Frisius - idea Huygens - 1st clock Huygens - 2nd clock H-1 H-2 H-3 H-4 H-5 ffffff aa88ff aaff88 true