  We use the effective field theory for gravitational bound states, proposed by
Goldberger and Rothstein, to compute the interaction Lagrangian of a binary
system at the second Post-Newtonian order. Throughout the calculation, we use a
metric parametrization based on a temporal Kaluza-Klein decomposition and test
the claim by Kol and Smolkin that this parametrization provides important
calculational advantages. We demonstrate how to use the effective field theory
method efficiently in precision calculations, and we reproduce known results
for the second Post-Newtonian order equations of motion in harmonic gauge in a
straightforward manner.
