The Trilogy Set pays homage to three famous names in astronomy: Galileo, Copernicus, and Johannes Kepler. The first in the trilogy is the Astrolabium Galileo Galilei, which indicates the position of the sun, moon, and stars as seen from Earth. It also tells sunrise, sunset, dawn, dusk, moon phases, moonrise, moonset, and eclipses of sun and moon. The Planetarium Copernicus, which shows the astronomical positions of the planets in relation to the Sun and the Earth, is the second. The third, and last, instrument of the Trilogy is the Tellurium Johannes Kepler, which rotates the Earth in its true geographical shape as seen from above the North Pole and has a perpetual calendar that completes one turn each year. The Trilogy is a limited edition of 100 sets.