"British astronomer" . "Norman Robert Pogson, CIE (23 March 1829 \u2013 23 June 1891) was an English astronomer who worked in India at the Madras observatory. He discovered several minor planets, made observations on comets and deduced a mathematical scale of stellar magnitudes with the ratio of two successive magnitudes being the fifth root of one hundred (~2.512) and referred to as Pogson's ratio."@en . "1829-03-23Z"^^ . "1829Z"^^ . "1891-06-23Z"^^ . "1891Z"^^ . . . . "Pogson, Norman Robert"@en . . "Norman Robert Pogson"@en . . . .