History & The Arts
Latitude and Longitude
...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 local time (obtained using the sun), so enabling the island’s longitude to be calculated. The...