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KITLV Spyk J. van der Observatoire de Peking Copper engraving .tif nl Observatoire de Peking en Observatoire de Peking fr Observatoire de Peking Degr pour monter l'observatoire Salle ou se retirent les observans Sphere equinoxiale Globe celeste Sphere Zodiacale Horison azimut Quart de cerle Sextant cm exhibition history Universiteitsbibliotheek