2009-09-19
8 people, 8 different places
Strangers who were not talking to each other described a triangle shape, hovering within hours of each other, mostly in evening.
What was also happening that evening
Nothing we can test fits. No fireball was recorded, no earthquake, the moon was not full, Venus was not unusually placed, and it was not a date people set off fireworks. That does not make it anything. It means the ordinary answers we can check did not apply.
Were you there?
Both answers are useful, and the second one more than people think. If you were outside on 2009-09-19 in that part of the world and saw nothing at all, say so. A record that only collects sightings can never be argued with.
What people wrote
The accounts behind this are short archive entries rather than full narratives. Why that happens
The numbers behind this cluster
E-2009-09-19-40-75 · 8 accounts across 8 places · wording independence 0.636 · coherence 4.056 · sources nuforc:8
Wording independence near 1.0 means people described it in their own words rather than repeating each other.