Example image of eyePlorer eyePlorer map for 'Armillary sphere': Celestial sphere Eratosthenes Greek astronomy Hipparchus Celestial pole Circle of latitude Ecliptic Equator Latin Meridian (astronomy) Earth Sun Celestial mechanics Star Telescope Axial tilt Ptolemy 3rd century BC Hellenistic civilization Astronomer China Calendar Shi Shen Han Dynasty Zhang Heng Clepsydra Li Chunfeng Tang Dynasty Society of Jesus Escapement Yi Xing Striking clock Shen Kuo Gnomon Pole star Jang Yeong-sil Koreans Sejong the Great Honcheonsigye Joseon Dynasty Astronomy in medieval Islam Ibrahim al-Fazari Abbas Ibn Firnas Astrolabe Inventions in medieval Islam Islamic Golden Age Middle Ages Al-Nayrizi Declination Meridian
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