Very informative and detailed article on how to create a Papervision Planetarium. Demo shows real constellations found on sites like NOMAD (they use standard astro-celestial coordinates). The author used particle technique to make this planetarium. In general, there are lots of things things you can do with particles: make fire, smoke, a flock of birds, watefalls etc. Planetarium is a cool example.
You have an opportunity to watch the “how-to” video and download the source code. Great thing is that the entire code is only about 200 lines (counting spaces). This Papervison tutorial consists of two main parts: step by step you will learn how to create a SkyMap class and the main Flex application which uses the SkyMap class.