If such external influences as the impact of a comet on the solar surface could destroy or mask the coherence of observed solar oscillations, the scope and effectiveness of extended study in this field would be considerably limited. It is therefore important to investigate any possible effects due to the recently reported comet impacts on the sun. Three such events were recorded by Sheely et al. (1982), and the last of these, on 8.0 UT July 20, 1981, occurred while full disk optical resonant scattering determinations of the solar velocity spectrum were being made. It is found that its effect on the 5-min oscillations is not noticeable,and that it is therefore meaningful to study solar oscillation data in order to resolve the question as to the internal rotation of the sun.