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Alberto Pepe added 31367557936267.md
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\section{Stellar Structure}
An isobar with volume $\VP$ and surface area $\SP$ deviates from spherical symmetry in the presence of rotation.
However one can retain a 1D approximation by re-defining the radius coordinate
as the radius of a sphere containing the same volume $\VP=4\pi \rP^3/3$, which allows to re-write the equation
of continuity in the usual form
\begin{equation}
\dxdycz{\mP}{\rP}{t}=4\pi\rP^2\rho
\;,
\end{equation}
