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This tag is for questions on the meaning, history, and usage of various symbols and notation that are used to denote different quantities in physics. Don't forget to mention the reference, where you encountered those notations.
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What is the $ \theta' $ means in Kepler problem in Goldstein's Classical Mechanics?
In Goldstein's Classical Mechanics, 3 edition, equation 3.50 is
\begin{align*}
\theta=\theta^{\prime}-\int\frac{du}{\sqrt{\frac{2mE}{l^2}+\frac{2mku}{l^2}-u^2}}\tag{3.50}
\end{align*}
I think $ \thet …