Biography
Giovanni Domenico Cassini was the founding director of the Paris Observatory. He discovered four of Saturn's moons and the dark gap in its rings now called the Cassini Division, and his measurement of the parallax of Mars helped fix the scale of the Solar System for the first time. The Cassini mission to Saturn was named in his honour.
Scientific contributions
- Discovered the Cassini Division in Saturn's rings (1675)
- Discovered four moons of Saturn
- Measured the rotation periods of Jupiter and Mars
Observatories, instruments & objects
Knowledge connections
- Part ofThe Scientific Revolution
- ObservedSaturn
- ObservedJupiter
- ObservedMars
Sources & references
The primary and reference sources this topic draws on.
- BritannicaEncyclopaedia Britannica
General reference for the history of astronomy, biographies, and cultural context.
- IAUInternational Astronomical Union
Official naming, definitions, constellation boundaries, and astronomical nomenclature.