...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」
...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 path of the latter bears unmistakabletraces of the Jupiter perturbations, as well as of the Mercuryperturbations...
Robert Stawell Ball 「The Story of the Heavens」
...We have already explainedhow perturbations arise from Mercury and from Jupiter...
Robert Stawell Ball 「The Story of the Heavens」
...From the law of gravitation we learn that theability of a planet to produce perturbations depends directlyupon its mass, since the force F which it exerts containsthis mass, m', as a factor...
George C. Comstock 「A Text-Book of Astronomy」
...Less conspicuous divisions are seen from time to time inother parts of the ring, where the perturbations, thoughless, are still appreciable...
George C. Comstock 「A Text-Book of Astronomy」
...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」
...After these great successes the two astronomers naturally proceeded tostudy the mutual perturbations of all other bodies in the solar system...
Oliver Lodge 「Pioneers of Science」
...Castor is a double star;but a third star or planet, as yet undiscovered, is required toaccount for its perturbations...
Henry Warren 「Recreations in 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」
...Simon Newcomb was directed to the solution of this question, and he arrived at the conclusion that the planetary perturbations could not explain the actual situation of the asteroidal orbits...
Garrett Serviss 「Curiosities of the Sky」
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