Somnium ya da Ay Astronomisi by Johannes Kepler

Along with learning Danish, Duracotus learns of astronomy from Tycho and his students.

Tycho asks his students to teach Duracotus Danish so they can talk. Since Duracotus is made seasick by the trip there, the skipper leaves Duracotus to deliver the letter and stay with Tycho. 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). After he cuts into one of these bags and ruins her sale, Duracotus is sold by Fiolxhilde to a skipper. Duracotus' mother, Fiolxhilde, makes a living selling bags of herbs and cloth with strange markings on them. The dream begins with Kepler reading a book about Duracotus, an Icelandic boy who is 14 years old. He recounts a strange dream he had from reading that book. The story begins with Kepler reading about a skillful magician named Libussa. Carl Sagan and Isaac Asimov have referred to it as one of the earliest works of science fiction. 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. In the narrative, an Icelandic boy and his witch mother learn of an island named Levania (the Moon) from a daemon.

It was first published in 1634 by Kepler's son, Ludwig Kepler, several years after the death of his father. 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.

Somnium ya da Ay Astronomisi by Johannes Kepler