On this day in 1857 - September 10th - American astronomer James Keeler was born.
Keeler was the director of the University of Pittsburgh's Allegheny Observatory in 1891, and later Lick Observatory in California. He was known for his studies of the rings of Saturn and for expanding astronomers' understanding of nebulae through an extended series of photographs using a large telescope.
On this day in 1915 - September 14th - John Lowry Dobson was born.
Dobson was a keen amateur astronomer and popularizer of astronomy. He designed and promoted a quality telescope that could be made using inexpensive, readily available materials. The Dobsonian telescope meant that amateur astronomers could afford a portable instrument of a size and aperture that would otherwise be beyond their means.
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