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| 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