Mathematicians Of The Day

28th September

On this day in 1695, after fitting several comets data using Newton's proposal that they followed parabolic paths, Edmund Halley tested his own measurements of the 1682 comet against an elliptical orbit. He wrote to Newton,
I am more and more confirmed that we have seen that Comet now three times since the year 1531.

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Quotation of the day

From Guglielmo Libri
[Poisson's] only passion has been science: he lived and is dead for it.