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Astronomy. --- Observatories. --- Planets. --- Stars. --- Transit-circle. --- United States. --- Sun. --- Mercury (Planet) --- Venus (Planet)
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52 <063> --- Astrolabes --- -Astrometry --- -Astronomical photometry --- -Transit-circle --- -Meridian-circle --- Astronomical instruments --- Transit-instruments --- Brightness (Astronomy) --- Photometry, Astronomical --- Photometry --- Positional astronomy --- Spherical astronomy --- Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Congresses --- Astrometry --- Astronomical photometry --- Transit-circle --- Congresses. --- -Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Meridian-circle --- Astrométrie. (Congrès) --- Astrometrie. (Congres)
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