Who discovered the moons of Saturn called Rhea, Iapetus, Dione and Tethys, between 1671 and 1684?
Tethys (moon) dust that surrounded Saturn soon after its formation. Tethys has been approached by several space probes including "Pioneer 11" (1979), "Voyager 1" (1980), "Voyager 2" (1981), and multiple times by "Cassini" since 2004. Tethys was discovered by Giovanni Domenico Cassini in 1684 together with Dione, another moon of Saturn. He had also discovered two moons, Rhea and Iapetus earlier, in 1671–72. Cassini observed all of these moons using a large aerial telescope he set up on the grounds of the Paris Observatory. Cassini named the four new moons as "Sidera Lodoicea" ("the stars of Louis") to honour king Louis XIV
Tethys (moon) of France. By the end of the seventeenth century, astronomers fell into the habit of referring to them and Titan as "Saturn I" through "Saturn V" (Tethys, Dione, Rhea, Titan, Iapetus). Once Mimas and Enceladus were discovered in 1789, the numbering scheme was extended to "Saturn VII" by bumping the older five moons up two slots. The discovery of Hyperion in 1848 changed the numbers one last time, bumping Iapetus up to "Saturn VIII". Henceforth, the numbering scheme would remain fixed. The modern names of all seven satellites of Saturn come from John Herschel (son of William Herschel, discoverer of