Flatness
The flatness , F , of a Planet is a measurement of sound “ellipticity”; a Sphère has a flatness of 0, whereas a infinitely thin disc has a flatness of 1.
A planet in rotation has a tendency natural to be flattened, the Effet centrifuges creating a “equatorial pad”. Mathematically, flatness is given by:
There is also the second flatness, f' (sometimes indicated as a " N "), that is the tangente2 of half-angle:
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