...He invented a mathematical method which he used for computing the ratio of thepolar to the equatorial diameter...
George Forbes 「History of Astronomy」
...This led Euler to write a valuable essay disclosing a newmethod of computing perturbations, called the instantaneous ellipse withvariable elements...
George Forbes 「History of Astronomy」
...—The Century Dictionary defines chronologyas "the science of time"—that is, "the method ofmeasuring or computing time by regular divisions or periodsaccording to the revolutions of the sun or moon...
George C. Comstock 「A Text-Book of Astronomy」
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