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APPENDIX 245 international catalogue of 362 cases prior to 1963, (B) an international catalogue comprising 375 cases for the period 1963-70 and (C) 100 cases from Spain and Portugal. On these curves it can be seen that the number of close encounters is very low during the daylight hours. It starts increasing about five P.M. and reaches a maximum about nine P.M. It then decreases steadily until one A.M., then rises again to a secondary peak about three A.M. and returns to its low diurnal level by six P.M. Since these curves were published, other researchers have conducted their own studies which have led to similar results. In particular Fred Merritt, working from David Saunders's UFOCAT files, found that electromagnetic effect cases, physical trace reports, and occupant re- ports had a major peak at nine P.M. and a low daytime average (6). The occupant reports showed a secondary peak about three A.M. (Figure 2). Researcher Jenny Randies conducted her own study of 223 cases from the files of two British groups (7) and found a very similar pattern of high nocturnal activity with a major evening peak and a secondary predawn peak. Abduction reports, however, showed a maximum about midnight (Figure 3). Given such a stable pattern, we are led to ask, what would the hourly distribution look like if we had a constant number of potential wit- nesses, in other words, if people did not retire at night? The answer can be approximated by taking the average distribution of outdoor popula- tion as a function of time of day and computing a deconvolution against the sighting report curve. This operation yields an activity curve that rises continuously throughout the night and peaks about three A.M. It also shows that the total number of actual events should be 14 times the number of observed phenomena. This gives a total estimate of 14 million landings in forty years if we strictly adhere to the ETH. The question to be answered is: what objectives could extraterrestrial visitors to the earth be pursuing that would require them to land 14 million times on our planet? It should be kept in mind that the surface of the earth is clearly visible from space, unlike Venus or other planetary bodies shrouded in a dense atmosphere. Furthermore, we have been broadcasting information on