A timeline of events, by no means comprehensive and is continuously updated
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The Beginning, 3000 BC Sumeria
The earliest known record of a UFO sighting dates back to ancient times. There is a depiction of a disk-shaped object in a Sumerian text from 3000 BC.
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1290-1279 BC Ancient Egypt
In ancient Egypt, there are hieroglyphs that depict strange objects in the sky. Some people believe that these hieroglyphs are evidence of ancient UFO sightings.
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4th century BC, Ancient India
The earliest reported UFO sighting in ancient India was in the 4th century BC. It was recorded in the Mahabharata, one of the two major Sanskrit epics of ancient India
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10th Century AD Japan ufo sightings
In the 10th century AD, a Japanese historian recorded a sighting of a "large, bright object" in the sky.
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15th century AD Italy ufo sightings
15th century AD, Leonardo da Vinci drew a sketch of a "strange object" that he saw in the sky.
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1942, The Battle of Los Angeles
Anti-aircraft fire lit up the skies of Los Angeles on February 24, 1942, but no enemy aircraft were ever found, fueling speculation of a UFO attack.
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1947, Roswell, New Mexico
The Roswell UFO incident is a purported event that occurred in 1947 near Roswell, New Mexico, United States. It is one of the most famous UFO cases in history.