Roy Dutton is an ex aeronautical engineer. In 1967 he started studying reported cases of "Strange Aerial Craft". Over a 40 year period he has applied his datailed knowledge of space aeronautics to correlate the data into a theory which attempts to explains the phenomenon. Roy contends that the UFOs often seen on or around Earth by witnesses are scout craft which originate from larger mothership type craft. These motherships use specific orbital paths over the Earth. His theory is derived by discovering patterns in the time and geographic location of sightings on Earth and correlating this with particular space paths around the Earth. The theory gives rise to timing charts which predict when a UFO sighting is more likely at particular points on the globe.