History & The Arts
Latitude and Longitude
...des Sciences observatory in Paris. As Galileo had suggested, he used the moons of Jupiter to map the world. The eclipses of Jupiter’s moons were timed in Paris using a pendulum clock. In 1681, Cassini travelled to the island of Goree in the West Indies to repeat his measurements. Absolute time was found on the island by observing the eclipses, and this was compared to...