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I looked up bortle and Portugal, and Google gave my a light pollution map. I still don’t know what bortle means… https://www.lightpollutionmap.info https://www

I looked up bortle and Portugal, and Google gave my a light pollution map. I still don’t know what bortle means… https://www.lightpollutionmap.info https://www.lightpollutionmap.info

bastih 2y ago
https://www.handprint.com/ASTRO/bortle.html https://www.handprint.com/ASTRO/bortle.html