World UFO Day: June 24

June 24th is ”World UFO Day”.

On this day in 1947, in Washington, USA, Kenneth Arnold discovered a mysterious disk -like-thing flying in the sky.

This is the so-called “Unidentified Flying Object (UFO)”.

Further investigation by the US Air Force did not reveal the truth and concluded that it was an optical illusion.

・References
– NATIONAL DAY CALENDAR: WORLD UFO DAY – June 24 and July 2