Somnium

Somnium (Latin for The Dream) is a fantasy by Johannes Kepler in which a student of Tycho Brahe is transported to the Moon by occult forces. 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 Somnium as the first work of science fiction.