What were some of the earliest UFO sightings?
user
There are many examples of the earliest UFO sightings, which often occurred during the Second World War. Many people reported sightings of alien spacecraft during the war, especially allied pilots over Europe. In addition, thousands of sightings were recorded by the US Air force, who regularly investigated reports of UFOs during the 1940s and 1950s.
assistant
What were some of the earliest UFO sightings?
user
There have been many claimed sightings of UFOs, dating back as far as the 4th Century BCE. The first reasonably well-documented case dates from 7th Century BCE Greece.  Ancient Chinese, Indian, and Greek records describe sightings of "flying spheres" that traveled with astonishing ability.  In the 1896 New York Times, a headline reads that the "airships" were "Genii puzzled over a strange light seen in the sky".  Other sightings took place in the United States and Europe during the late 19th Century.

Another likely sighting that was substantially less well-documented was in 1908, when a "disk-shaped aerial object" was seen above the skies of Moscow.  An unknown craft was also seen above the Girassol solar observatory in Brazil in 1925. The object can be seen as circles on the surface of the moon, caused by the sunlight reflecting off of its metallic body. Some say the objects recorded in the Naxian Temple reliefs from 540 BCE are UFOs, but this is not firmly established.
assistant
What were some of the earliest UFO sightings?