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Asaph Hall   Listen
Asaph Hall

noun
1.
United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907).  Synonym: Hall.






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"Asaph hall" Quotes from Famous Books



... Mr. Clark turned the great eye upon the invisible thing and read the writing with ease. But a greater feat than this was accomplished by the same instrument— the discovery of the two little moons of Mars, by Prof. Asaph Hall, in 1877. They are so small as to be incapable of measurement by ordinary means, but with an ingenious photometer devised by Prof. Pickering of Harvard College, he determined the outer satellite to be six and the inner seven miles in diameter. The discovery of these minute bodies seems past belief, ...
— Scientific American Supplement, No. 288 - July 9, 1881 • Various



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