...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」
...Meanwhile, one of the ablest French astronomers, Le Verrier, experienced incomputing perturbations, was independently at work, knowing nothing aboutAdams...
George Forbes 「History of Astronomy」
... The movements of not a few double stars point to perturbations causedby the attraction of unseen bodies...
E. Walter Maunder 「Are the Planets Inhabited?」
...We are thus led to the conclusion thatthe planetary perturbations are unable to affect the stability of thesolar system...
Robert Stawell Ball 「The Story of the Heavens」
...The comet in its journey passes near thepath of Jupiter, and experiences great perturbations from that mightyplanet...
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」
...The small mass of comets is also brought before us in a very strikingway when we recall what has been said in the last chapter on theimportant subject of the planetary perturbations...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...But their perturbations would be very minute, and moreover,on Laplace's theory, would only result in periodic changes, providedeach mass were rigid...
Oliver Lodge 「Pioneers of Science」
...But the inverse problem: Given the perturbations, to find the planetwhich causes them—such a problem had never yet been attacked, and byonly a few had its possibility been conceived...
Oliver Lodge 「Pioneers of Science」
...Still, he would test him: he would ask for further explanationsconcerning some of the perturbations which he himself had speciallynoticed, and see if Mr...
Oliver Lodge 「Pioneers of Science」
...Bythe perturbations of planetary attraction, or by different originalvelocities, a comet may be lengthened into an invisible stream, oran invisible stream agglomerated till it is visible as a comet...
Henry Warren 「Recreations in Astronomy」
...But he knew from previous calculations that this mighteasily be due to planetary perturbations...
George Forbes 「History of Astronomy」
...Mathematicalastronomers have taken great interest in the perturbations of the satellites,because their relative periods introduce peculiar effects...
George Forbes 「History of Astronomy」
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