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1 jan 1684 ano - Gian Domenico Cassini

Descrição:

(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

Adicionado na linha do tempo:

Data:

1 jan 1684 ano
Agora
~ 342 years ago