. On this day in 1857 – September 10th – American astronomer James Keeler was born in La Salle, Illinois.
Keeler was the director of the University of Pittsburgh's Allegheny Observatory in 1891, and later of Lick Observatory in California. Among other things, he was known for his studies of the rings of Saturn, confirming that Saturn’s ring system is not a solid unit, and for expanding astronomers' understanding of nebulae through an extended series of photographs using a large telescope.
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