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50th anniversary: A series of celestial phenomena of disputed nature was observed in the western...

Mon, September 20, 2027

in 10 mo

Source

In 1977, A series of celestial phenomena of disputed nature was observed in the western Soviet Union, Finland and Denmark.

Also on Sep 20, 2027

Source, method and history
Source
Wikipedia
How we know
Wikipedia "On this day" selected anniversary, 50 years (1977 to 2027).
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annual
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None recorded.