oct 25, 1671 - Sidera Lodoicea is discovered by Giovanni Cassini
Description:
(Initially named Sidera Lodoicea by Giovanni Cassini, it would be give in a numerical designation by astronomers. It wasn't until John Herschel named it Iapetus in his publication "Results of Astronomical Observations Made during the Years 1834, 5, 6, 7, 8, at the Cape of Good Hope")Added to timeline:
Date:
oct 25, 1671
Now
~ 354 years ago