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of the Newtonian theory, because it was a
new kind of calculation of perturbations,
and also it added a new member to the so-
lar system, and gave a prospect of adding
many more.
When Halley’s comet reappeared in 1835,
Pontecoulant’s computations for the date
of perihelion passage were very exact, and
afterwards he showed that, with more ex-
300
