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Dr. J. Allen Hynek developed the following classification system for use in analyzing UFO encounters.
Nocturnal Light A visual sighting of a light on the sky at night. About 35 - 40 % of all reports are nocturnal lights.
Nocturnal Disc* A visual sighting of a UFO in form of a structured light seen at night.
Daylight Disc A visual sighting of a UFO with distinct shape seen at daytime.
Radar Cases UFOs detected on radar.
Radar Visual Cases UFOs detected on radar and visually at the same time. About 1 - 2% of al reports are radar visual cases.
Close Encounters of the First Kind A UFO observed within 150 yards.
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Close Encounters of the Second Kind A UFO that leaves some kind of evidence like burn marks on the ground or fragments of unknown material.
Close Encounters of the Third Kind A UFO with visible occupants.
Close Encounters of the Fourth Kind Abductions.
Close Encounters of the Fifth Kind Communication between a human and an alien.
* Added to the Hynek system later.
Lynn Taylor, Association for Aerial Anomaly Research and
Cataloging (AAARC)
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