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**Aryth** Those are all approximations (With the exception of the sum/product), I'm familiar with those and I have my own approximation whose error cannot exceed:

$\displaystyle \delta = \frac{0.4e^8}{(1 - e^2)}$

Where e is eccentricity and for my particular case, it is:

$\displaystyle e = 0.05$

So, the approximation is very close, yet I wish to have an exact measurement, and according to my research, this is one of four exact methods.

I was wondering how to use the series above. I'm not very experienced with infinite series, which is why I posted it.