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James Gregory, Scottish mathematician and astronomer, (1870). Artist: William HollJames Gregory, Scottish mathematician and astronomer, (1870). In 1663 Gregory (1638-1675) published Optica Promota describing his design for a reflecting telescope
James Gregory, 17th century Scottish mathematician and astronomer. In 1663 Gregory (1638-1675) published Optica Promota describing his design for a reflecting telescope