For instance, such type of planetarium could project the solar eclipse and was built for both scientific and educational purposes. The scientists of that time wrote: "Such a visual aid has never existed before. Both enlightening and magical for people. It looks like a school, theater, and cinema at the same time. A classroom is under the heavens and a show where the celestial bodies are actors ".
The smallest planetariums can project only the fixed number of stars: the Sun, Moon, planets, and nebula. The larger devices are able to demonstrate the comets and much bigger number of stars. The idea of creating a device that would be able to imitate the starry sky and planets appeared a long time ago. Thus, such device was built by Archimedes and was described in his essay. Unfortunately, neither the device nor essay had been saved.