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Astronomy --- Astronomie --- Early works to 1800 --- Ouvrages avant 1800 --- Astronomy, Arab. --- Alfonso, --- Knowledge --- Astronomy. --- Astronomy, Arabic --- Astronomy, Medieval --- Medieval astronomy --- Arab astronomy --- Alfonso X, King of Castile and Leon --- -Knowledge --- -Astronomy --- Astronomy, Arab --- Afonso --- Alfons, --- Alfonso --- Alonso, --- Alphonse, --- Alphonse --- Anfós, --- Castille, Alphonse de, --- De Castille, Alphonse, --- Alphonse X (roi de Castille et de León ; 1221-1284) --- Astronomie arabe --- Astronomie médiévale --- Histoire --- Alphonse X (roi de Castille et de León ; 1221-1284) --- Astronomie médiévale

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Astronomy --- Astronomie --- Early works to 1800 --- Ouvrages avant 1800 --- Astronomical instruments --- Instruments, Astronomical --- Optical instruments --- Physical instruments --- Scientific apparatus and instruments --- Space optics --- Instruments