I looked up bortle and Portugal, and Google gave my a light pollution map. I sti... | Hacker News

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		zeristor 7 months ago \| parent \| context \| favorite \| on: World's darkest and clearest skies at risk from in... 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

bastih 7 months ago [–]

https://www.handprint.com/ASTRO/bortle.html

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