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Circa-monthly activity conducted by moonlight is observed in many species onEarth. Given the vast amount of artificial light at night (ALAN) that polluteslarge areas around the globe, the synchronization to the circalunar cycle isoften strongly perturbed. Using two-year data from a network of 23 photometers(Sky Quality Meters; SQM) in Austria (latitude ~48{\deg}), we quantify howlight pollution impacts the recognition of the circalunar periodicity. We do sovia frequency analysis of nightly mean sky brightnesses using Fast FourierTransforms. A very tight linear relation between the mean zenithal night skybrightness (NSB) given in mag$_{SQM}$ and the amplitude of the circalunarsignal is found, indicating that for sites with a mean zenithal NSB brighterthan 16.5 mag$_{SQM}$ the lunar rhythm practically vanishes. This findingimplies that the circalunar rhythm is still detectable (within the broadbandpass of the SQM) at most places around the globe, but its amplitude againstthe light polluted sky is strongly reduced. We find that the circalunarcontrast in zenith is reduced compared to ALAN-free sites by factors of 1/9 inthe state capital of Linz (~200,000 inhabitants) and 1/3 in small towns, e.g.Freistadt and Mattighofen, with less than 10,000 inhabitants. Only two of oursites, both situated in national parks (Bodinggraben and Z\"oblboden), shownatural circalunar amplitudes. At our urban sites we further detect a strongseasonal signal that is linked to the amplification of anthropogenic skyglowduring the winter months due to climatological conditions.

Circalunar variations of the night sky brightness -- an FFT perspective on the impact of light pollution