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In page Unidentified flying object:

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As a bright comet that visits the inner solar system every 76 years, it was often identified as a unique isolated event in ancient historical documents whose authors were unaware that it was a repeating phenomenon.[citation needed] Such accounts in history often were treated as supernatural portents, angels, or other religious omens.[citation needed] While UFO enthusiasts have sometimes commented on the narrative similarities between certain religious symbols in medieval paintings and UFO reports,[2] the canonical and symbolic character of such images is documented by art historians placing more conventional religious interpretations on such images.[3] Some examples of pre-contemporary reports about unusual aerial phenomena include: