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Norman Robert Pogson Norman Robert Pogson (March 23, 1829 – June 23, 1891) was a British astronomer who worked in Oxford and in Madras, India. In 1856 he formalized the system of stellar magnitudes, by defining magnitudes logarithmically and fixing a difference of five magnitudes as corresponding to a hundred-fold difference in brightness. A lunar crater is named after him, and so is the asteroid 1830 Pogson. References Pogson, Norman Robert Pogson, Norman Robert Pogson, Norman Robert Pogson, Norman Robert
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