Somnium (Latin for "The Dream") — full title: Somnium, seu opus posthumum De astronomia lunari — is a novel written in Latin in 1608 by Johannes Kepler. It was first published in 1634 by Kepler's son, Ludwig Kepler, several years after the death of his father. In the narrative, an Icelandic boy and his witch mother learn of an island named Levania (the Moon) from a daemon. Somnium presents a detailed imaginative description of how the Earth might look when viewed from the Moon, and is considered the first serious scientific treatise on lunar astronomy. Carl Sagan and Isaac Asimov have referred to it as one of the earliest works of science fiction. Plot summary The story begins with Kepler reading about a skillful magician named Libussa. He falls asleep while reading about her. He recounts a strange dream he had from reading that book. The dream begins with Kepler reading a book about Duracotus, an Icelandic boy who is 14 years old. Duracotus' mother, Fiolxhilde, makes a living selling bags of herbs and cloth with strange markings on them. Duracotus is sold by Fiolxhilde to a skipper after cutting into one of these bags and ruining her sale. He travels with the skipper for a while until a letter is to be delivered to Tycho Brahe on the island of Hven (now Ven, Sweden). Since Duracotus is made seasick by the trip there, the skipper leaves Duracotus to deliver the letter and stay with Tycho. Tycho asks his students to teach Duracotus Danish so they can talk. Along with learning Danish, Duracotus learns of astronomy from Tycho and his students. Duracotus is fascinated with astronomy and enjoys the time they spend looking at the night sky. Duracotus spends several years with Tycho before returning home to Iceland. Upon his return to Iceland, Duracotus finds his mother still alive. She is overjoyed to learn that he is well-studied in astronomy as she too possesses knowledge of astronomy. One day, Fiolxhilde reveals to Duracotus how she learned of the heavens. She tells him about the daemons she can summon. These daemons can move her anywhere on Earth in an instant. If the place is too far away for them to take her, they describe it in great detail. She then summons her favorite daemon to speak with them. The summoned daemon tells them, "Fifty thousand miles up in the Aether lies