Sightings of strange objects in the sky have been recorded for a very long time. For example, in 217 BC “at Arpi round shields (parmas) were seen in the sky” (Liv. 22.1.9; Orosius 4.15). A parma was a small round shield made of iron, bronze and other metals. According to NASA, “we do not know whether the luster of these devices (and not just their shape) was intended to be an element of the description. Mock suns are an unlikely explanation, since in the Roman prodigy lists these were routinely described as “double suns” or “triple suns” (i.e. two mock suns on either side of the real one).” (source)

To read more, click here.