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52 <063> --- Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Celestial reference systems --- Congresses. --- Celestial coordinate systems --- Celestial frames of reference --- Celestial reference frames --- Coordinate systems, Celestial --- Frames of reference, Celestial --- Reference frames, Celestial --- Reference systems, Celestial --- Coordinates --- Geodetic astronomy --- Congresses