Saturn's rings were seen in 1610
1610年已觀測到土星光環

In 1610, Galileo Galilei became the first person to observe Saturn's rings; however, he described them as "ears." It was not until 1655 that Christian Huygens was able to use his higher-quality telescope to become the first person to describe the feature as an actual ring surrounding Saturn. Finally, in 1675, Giovanni Cassini determined that Saturn's "ring" was actually composed of subrings with gaps between them.
1610年伽利略就已經是第一個觀測到土星光環的人了，不過當時他把光環稱之為“耳朵”。直到1655年，克里斯蒂安·惠更斯才使用更高倍的望遠鏡觀察土星，并對土星光環的性質做了具體描述。最終，在1675年，意大利天文學家卡西尼才確定了土星光環是由子環和其間的空隙所構成的。