Daniel Chote‘s son was learning about stars and astronomy in day-care, but was always in bed before it got dark. So, Daniel decided to use a Raspberry Pi to create a planetarium night-light! It involves a lot of tinkering and software installation to get just right, but he has written it all up in a friendly manner so you can get the result you want. The software, by the way, is Stellarium. Read part 1 of how to do it yourself here.