We are conducting a search for new gamma-ray binaries by making high signal-to-noise light curves of all cataloged Fermi sources and searching for periodic variability using appropriately weighted power spectra. The light curves are creating using a variant of aperture photometry where photons are weighted by the probability that they came from the source of interest. From this analysis we find that the light curves of a number of sources near the ecliptic plane are contaminated by emission from the Moon. This shows itself as modulation on the Moon's sidereal period in the power spectra. We demonstrate that this contamination can be removed by selecting times when the Moon was too close to a source.