| John Bortle's Dark Sky Scale | |
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Resource/On Line |
| URL: | http://www.frostydrew.org/observatory/columns/essays/bortle.htm |
| Description: | John Bortle created a new scale of sky darkness which he published in the February 2001 issue of Sky and Telescope. |
| Title: | John Bortle's Dark Sky Scale |
| Clicks: | 0 |
| Link Added: | 07-08-2008 |
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