The number of UFO sightings reported varies by day, month, and year. There are periods with many reports, such as 1973 in the United States, or 1978 in Italy, but we don’t understand what causes the increase in sightings. Is it an increase in the UFO phenomenon itself, or is it instead an increase in the number of people viewing the sky, or even the willingness or ease of reporting a sighting?

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