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Possible Answers: Oval.
Last seen on: Daily Celebrity Crossword – 12/7/18 Sports Fan Friday
Random information on the term “Oval”:
A Cassini oval is a quartic plane curve defined as the set (or locus) of points in the plane such that the product of the distances to two fixed points is constant. This may be contrasted with an ellipse, for which thesum of the distances is constant, rather than the product. Cassini ovals are the special case of polynomial lemniscates when the polynomial used has degree 2.
Cassini ovals are named after the astronomer Giovanni Domenico Cassini who studied them in 1680.[1] Cassini believed that the Sun traveled around the Earth on one of these ovals, with the Earth at one focus of the oval.[citation needed]Other names include Cassinian ovals, Cassinian curves and ovals of Cassini.
As with an ellipse, the fixed points P 1 , P 2 {\displaystyle P_{1},P_{2}} are called the foci of the Cassini oval.