Unidentified Floating Object: Edo Images of UFOs

    This utsuro-bune (hollow or vacant ship) appears in at least twelve literary sources from the late Edo period. 

~ article.

    The late Edo period, also known as the Bakumatsu period, was the final years of the Edo period of Japan, from 1853 to 1867. During this time, Japan ended its isolationist foreign policy, known as sakoku, and transitioned from a feudal shogunate to the Meiji government. 

~ wikipedia

Edo, formerly also written Yedo, Jp. えど, 江戸, former name of Tokyo before the Meiji emperor moved his residence there from Kyoto