National Geographic Society – Palomar Observatory Sky Survey

National Geographic Society – Palomar Observatory Sky Survey
Alternative namesNGS-POSS
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The National Geographic Society – Palomar Observatory Sky Survey (NGS-POSS, or just POSS, also POSS I) was a major astronomical survey, that took almost 2,000 photographic plates of the night sky. It was conducted at Palomar Observatory, California, United States, and completed by the end of 1958.

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