The studies carried out at the Sayan Solar Observatory indicated the existence of quasi-periodic variations in the position and shape of H2O and O2 telluric spectral lines. Periods of these fluctuations lie in the region of solar oscillations under study, namely, from 3 to 40 minutes. This fact should be taken into consideration when using telluric lines as a reference. These measurements may also be useful when studying wave processes in the Earth's atmosphere.