Omen
An omen is a sign that is thought to foretell the future, often signifying the advent of change. The word can mean something either "good" or "bad" is about to happen. The origin of the word is unknown, although it may be connected with the Latin word audire, meaning "to hear". An example from the past, babies born with birth defects were believed to be a bad or evil omen.
Omen Media
Manuscript of the mid-nineteenth century, possibly of Sgaw Karen origin, shows various appearances in the sun, the moon, clouds, etc., and indicates the primarily bad omens these appearances foretell. Explanations in English were added to this manuscript by a nineteenth-century American missionary.
Halley's Comet's appearance in 1066 was recorded on the Bayeux Tapestry. ISTI MIRANT STELLA literally means "These ones are looking in wonder at the star". National Geographic translated it in a 1966 article about the tapestry as "These men wonder at the star".