The Astrolabium Catholicum

१० 17th century Adriaen Metius ALTITUDE PARALLEL Amsterdam and Alexandria arm and pointer articulated arm ASCENSION AND DECLINATION astrolabe represents Astrolabium Catho Astrolabium Catholicum Barentsz and Heemskerk bookbinding celestial sphere circle distance COIMBRA common axes K-K components copies are preserved copper engravings copperengravings Courtesy Germanisches Museum Den Haag Diameter 30 cm disc distance between Amsterdam east or west ecliptic equator ERNST CRONE Franeker frontdisc Gemma Frisius geographic grid graduated circle graphic solution great-circle distance Guiljelmo half-spheres Hamburg copy HOUR CIRCLE instrument Instrumentmakers Jan Nanninghssoon Janssonius Caesius KAYSER latitude and longitude licum longitude and latitude Mathematical treatises Mathematici meridians are identical Nieuwe Nurnberg P-Al parallactic triangle performed by rotating Plancius point of departure Regular astronomical astrolabe represents a stereographic rete and limbus RIGHT ASCENSION Rijksmuseum rotating ruler rotating the ruler ruler and arm slide with arm sphere in stereographic spherical star's longitude stereographic projection weather-resistent Willem Janszoon Blaeu zenith circles