Night sky statistics
Comparisons across all 2080 places on Yozora Atlas: 1013 towns and cities and 1067 parks and dark-sky places in the United States, Canada, the United Kingdom and Ireland. Every number comes from the same open data as the place pages.
How far is the nearest dark sky from each city?
294 of 1013cities within an hour of a Bortle 4 sky
From 20 min to 3 h 41 min. The ten closest states and provinces, and every city.
Where has the night sky gotten brighter since 2012?
+101%Celina, Texas, the biggest rise of any city
514 of 1013 cities are more than 5% brighter than in 2012, 301 are darker. The ten biggest rises and falls.
Which places have the most clear nights?
229clear nights a year at Sand to Snow National Monument, more than anywhere else on the site
Against 1 on Aleutian Islands World War II National Monument. The ten dark places with the clearest skies, and every region.