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jan 1, 1684 - Gian Domenico Cassini

Description:

(1684) Gian Domenico Cassini (1625-1712) observes the third and fourth satellites of Saturn (Dione and Thetys) which compliment those first observed in 1671 and 1672.

https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjOxI7Nz4TfAhVQF6wKHUwTDU0QjRx6BAgBEAU&url=https%3A%2F%2Fwww.britannica.com%2Fbiography%2FGian-Domenico-Cassini&psig=AOvVaw2VGZhKCHLKOSnbt9k-ocmL&ust=1543959529701477

Added to timeline:

Date:

jan 1, 1684
Now
~ 342 years ago