THIS 18th century lost book could be the definitive evidence UFOs have been visiting mankind for centuries.

The latin-book - a mathematics textbook - was published in 1716 but shockingly on the cover shows a UFO emerging from the clouds.

​The disc-shaped object appears eerily similar to descriptions of crafts which have been frequently spotted menacing Earth.

Titled Liber De Coloribus Coeli, Accedit Oratio Inauguralis De Deo Mathematicorum Principe and written by Johann Caspar Funck, the UFO on the cover is seen hovering over rough seas surrounded by lightning.

“Is it proof that flying saucer UFOs have been visiting Earth since the early 1700s? At the very least, it's evidence that some people in the past seem to have thought so.”