What did Sir Isaac Newton do during the seventeenth century?

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Sir Isaac Newton calculated that a rotating planet would not be perfectly spherical, which is known as the oblate spheroid shape of the Earth. He also made significant contributions to the understanding of gravity and the laws of motion during the seventeenth century. While he did conduct experiments with light and optics, the options listed are not his most notable accomplishments during this time period.

What Did Sir Isaac Newton Do During the Seventeenth Century