Definition:Ovals of Cassini/Historical Note

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Historical Note on Ovals of Cassini

The curves now known as the ovals of Cassini were first investigated by Giovanni Domenico Cassini in $1680$, during the course of his study of the relative motions of Earth and the Sun.

Cassini believed that the Sun orbited Earth on just such an oval, with Earth at one of its foci.


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