The “Francesco Nicosia” planetarium of Roccapalumba, also called the “town of the stars” for its commitment to spreading astronomy, is an optical-mechanical instrument which allows virtually projecting, onto a semi-spherical dome, the stars and planets visible to the naked eye from every part of the planet. The projector simulates the movements of the planets of the Solar System, the rotation and revolving motion of the Earth, projects the ecliptic plane, the position of the Earth’s axis, the alternating seasons, dawn and sunset, the main constellations of the northern and southern sky, the images of the Zodiac, and the precessions of the equinoxes. The spectator is immediately absorbed by the movement of sidereal space and feels as if he/she is navigating through the infinite. Particularly suitable for educational and informative purposes, the instrument permits making concepts of celestial mechanics more evident and easier to understand. The planetarium has a seating capacity of 45 and lessons last about 50 minutes.