... The movements of not a few double stars point to perturbations causedby the attraction of unseen bodies... 
E. Walter Maunder 「Are the Planets Inhabited?」
...He saw that the meandistance did not alter, but it remained to be seen whether theeccentricity of the ellipse described by the earth might not be affectedby the perturbations...
Robert Stawell Ball 「The Story of the Heavens」
...Let us, for instance, assume a certain distance for thehypothetical body, and try if we can assign both an orbit and a mass forthe planet, at that distance, which shall account for the perturbations...
Robert Stawell Ball 「The Story of the Heavens」
...In the meantime the attention of Le Verrier, the great Frenchmathematician and astronomer, had been specially directed by Arago tothe problem of the perturbations of Uranus...
Robert Stawell Ball 「The Story of the Heavens」
...Theinfluences of the older planets were estimated once more with everyprecision, but only to confirm the conclusion already arrived at as totheir inadequacy to account for the perturbations...
Robert Stawell Ball 「The Story of the Heavens」
...The moon is attracted not only by the earth, but by the sun also;hence its orbit is perturbed, and Newton calculated out the chief ofthese perturbations, viz...
Oliver Lodge 「Pioneers of Science」
...7, the perturbations of the moon, thatperhaps most especially has struck all future mathematicians withamazement...
Oliver Lodge 「Pioneers of Science」
...Neptune was discovered from the perturbations of Uranus by sheercalculation, carried on simultaneously and independently by Leverrier inParis, and Adams in Cambridge...
Oliver Lodge 「Pioneers of Science」
...It is a good thing it isso: accurate astronomy would be impossible if we had to take intoaccount the perturbations caused by a crowd of invisible bodies...
Oliver Lodge 「Pioneers of Science」
...But he knew from previous calculations that this mighteasily be due to planetary perturbations...
George Forbes 「History of Astronomy」
...Meanwhile, one of the ablest French astronomers, Le Verrier, experienced incomputing perturbations, was independently at work, knowing nothing aboutAdams...
George Forbes 「History of Astronomy」
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