Dione is a mid-sized icy moon of Saturn, discovered by Giovanni Domenico Cassini at the Paris Observatory on the same night as Tethys. Cassini named the four moons he found the stars of Louis, in honour of King Louis XIV, and the individual names used today were proposed much later by John Herschel. Dione is made largely of water ice around a denser rocky core, and its trailing hemisphere shows bright wispy terrain that proved to be a network of icy cliffs and fractures. Images from the Cassini spacecraft revealed this detail, and the moon may possess a subsurface ocean.
Before and after
- from 7 October 1683 to 9 October 1683Battle of Párkány
- 10 November 1683Birth of George II of Great Britain
- 19 December 1683Birth of Philip V of Spain
- 1684Construction of 10 Downing Street
- 21 March 1684Discovery of Dione
- 21 March 1684Discovery of Tethys
- 5 April 1684Birth of Catherine I of Russia
- from 25 April 1684 to 26 January 1699Morean War
- October 1684Leibniz publishes the first paper on calculus
More in Universe & space
- 7 January 1610Discovery of Callisto
- 7 January 1610Discovery of Europa
- 7 January 1610Discovery of Ganymede
- 7 January 1610Galileo discovers the moons of Jupiter
- 25 October 1671Discovery of Iapetus
- 23 December 1672Discovery of Rhea
The era
This moment belongs to the Early modern world (1500 CE to 1760 CE), voyages, printing and new ideas. You can also browse everything in the 17th century.