iOptron SmartStar G-MC90   Norton’s Star Atlas 20th Edition

- International Year of Astronomy 2009
- Galileo at the Franklin Institute, Philadelphia
- Ältester Sternenatlas: Jupiterstationen und Mondhäuser (faz.de)
- Sir John Ritblat Gallery: Treasures of the British Library: Astronomy
- Dunhuang Map (wikipedia.org)
- Sky & Telescope