Did an alien vessel reach the coasts of Japan in 1803?

This has been more or less the question that many have asked since History Channel broadcasted a documentary about an old Japanese legend, displaying certain ancient drawings to the public that many did not hesitate to associate with an artistic depiction of a UFO. Or rather, the commonly held notions of the "rounded" shape of the unidentified object in question... Read the full story: http://www.etupdates.com/2012/09/14/did-an-alien-vessel-reach-the-coasts-of-japan-in-1803/#.U0cegOZdVy8