Located off to the right of the Observatory and behind a large wooden door lies a room made possible by means of a powerful Undetectable Extension Charm. Professor Flamsteed will hold the occasional lesson, present an educational and entertaining show about astronomy and the night sky, or a training session in celestial navigation here, but it is also available to students to use at their own leisure for research or entertainment purposes.

Professor Flamsteed just has a few guidelines for use of the planetarium:

• ABSOLUTELY no food or drink
• be respectful of the equipment
• NO SNOGGING