Photographic magnitude of stars brighter than 9m. 0 between declination +65⁰ and declination +75⁰ determined at the Royal observatory, Greenwich
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Image source: Open LibraryRoyal Greenwich Observatory.2 editions
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Royal Greenwich Observatory.
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Photographic magnitude of stars brighter than 9m. 0 between declination +65⁰ and declination +75⁰ determined at the Royal observatory, Greenwich
1 views - PMPhotographic magnitude of stars...Royal Greenwich Observatory.
Photographic magnitude of stars brighter than 9m. 0 between declination +65⁰ and declination +75⁰ determined at the Royal observatory, Greenwich