deletions | additions       diff --git a/The Moon.tex b/The Moon.tex  index 5ba3167..9f40415 100644  --- a/The Moon.tex  +++ b/The Moon.tex 
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Where $\dot{V}_m = V_m^2/a_m$ is the centripetal acceleration of the Moon due to its (nearly) circular orbit.   \begin{align}  \frac{G M_\oplus}{a_m^2} = {V_m^2/a_m} \frac{V_m^2}{a_m}  \end{align}  The Moon travels a distance $2\pi a_m$ every period, so $V_m = 2\pi a_m / P_m$