Question: When was the astronomer whose classification of close encounters with aliens was used to derive the title to "The Fourth Kind" born?
Sentence (from "J. Allen Hynek"): Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force under three consecutive projects: Project Sign (1947–1949), Project Grudge (1949–1952), and Project Blue Book (1952–1969).
Relevant evidence: No