1857-1900. American astrophysicist, probable discoverer of the dark narrow gap in the outer part of the A ring of Saturn, and the second director of Lick Observatory. Keeler was (probably accidentally) cheated of his rightful fame when the A ring gap became known as 'Encke's Division'. Encke had earlier seen a broad, poor contrast feature in the A-ring which is quite different from the sharp, distinct gap that Keeler recorded on the very first night of observing with the Lick 36-inch refractor. On the other hand, the gap may have been seen even earlier by Francesco De Vico, William Lassell and the Rev. William R. Dawes. The history of visual observations of gaps in Saturn's rings is very confusing.
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