deletions | additions       diff --git a/The Moon.tex b/The Moon.tex  index 931f5ac..2018e5c 100644  --- a/The Moon.tex  +++ b/The Moon.tex 
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\begin{equation}  P_m^2 &= \frac{4\pi^2 a_m^3}{G M_\oplus}   \label{keplersthird} \label{eqn:keplersthird}  \end{equation}  A more precise estimate is $a_m = 3.844 \times 10^{10}$~cm.