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|---|---|---|
 Date: 2009-03-12 08:42:47Light sources Space Measurement Amateur astronomy Bortle Dark-Sky Scale Scales Naked eye Limiting magnitude Milky Way Observational astronomy Astronomy Light pollution |
| First Page | Document Content | |
|---|---|---|
Date: 2009-03-12 08:42:47Light sources Space Measurement Amateur astronomy Bortle Dark-Sky Scale Scales Naked eye Limiting magnitude Milky Way Observational astronomy Astronomy Light pollution |
