1660. The illustration depicts a sighting by two Dutch ships in the North Sea of an object moving slowly in the sky. It appeared to be made by two disks of different size. The source for this account is one of the books entitled :"Theatrum Orbis Terrarum" by Admiral Blaeu. These books were compilations of articles by different authors and consisted of detailed accounts of long engagements at sea, cartography information etc.
Source: http://www.alien-ufo-pictures.com/ancient_aliens5.html
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