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In a pioneering exposition of mathematical astronomy for the public, Sir JohnHerschel attributed the stability of the ring of Saturn to its being eccentricwith respect to the planet and lopsided (asymmetric in mass) by a minuteamount. Tracing the sources and effects of this error reveals several lessonsof general relevance to science: on the formulation and interpretation ofcalculations, the use of cutting-edge observations and the combining ofobservations with theory. I emphasise the phenomenon of reinforcing errors.

Sir John Herschel and the Stability of Saturn's Ring