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35225 facts from 177 countries related to 1198 phenomena have been registered in Archive. 2834 of them were solved, another 11033 are under verification for compliance with one of the 322 versions.

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This section contains descriptions of unexplained facts provided by eyewitnesses or published in the media, as well as the results of their analysis by the group.

UFO. United States

ID	#1635697380
Added	Sun, 31/10/2021
Author	July N.
Sources	urbibl.ru Антонина ЗАЙЦЕВА «Уральский следопыт» №8-9, 1996 г.
Phenomena	UFO
Status	Hypothesis

Initial data

Initial information from sources or from an eyewitness

Incident date:

1887

Location:

United States

In Alaska in 1887, where an unknown city was regularly observed, which was explained by the mirage that arose.

Hypotheses

List of versions containing features matching the eyewitness descriptions or material evidence

Mirage

Optical phenomenon in which the air in the result of the refraction of light rays in addition to items in their true position, see their virtual images in the direct, inverted or severely distorted.

Distinguish mirages:

lower
top
side

Inferior Mirage occurs when a large vertical temperature gradient (drop it with the height) over a superheated flat surface, often desert or paved road. Usually this "puddle" on asphalte or sand.