The myth is that Rene Descartes thought of it while he stared at a fly on the ceiling.
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It is called Cartesian after its inventor, Rene Descartes. It is said that he was lying in bed, ill, and looked up to see an insect on the ceiling. He figured out that the position of the insect could be pinpointed by its distances from two mutually perpendicular edges of the ceiling. And so was born the coordinate plane.
There is an urban myth that Descartes invented the Cartesian plane by watching a fly on the ceiling and then trying to describe its movements based on its distance from the walls.
Myth only has one syllable.
An antonym or opposite word for myth would be fact. You could also say nonfiction or reality.
One syllable