At this light pollution map they show degrees of light pollution but they have 3 numbers to quantify light pollution and they do not explain in the help section what the numbers mean:

The numbers are SQM, brightness and artificial brightness. I get that for the last two the lower the better for viewing stars, but I can't figure out if brightness perhaps includes artificial brightness.

Screen shot of the legend

  • $\begingroup$ I added the screenshot which shows what I guess what you are talking about. Feel free to replace it, if you are talking about something else. $\endgroup$ – B--rian Jan 22 at 8:31
  • $\begingroup$ @JamesK Since you commented on my question about light pollution I guess you might be able to help bobsmith76 $\endgroup$ – B--rian Jan 22 at 8:33
  • $\begingroup$ Does astronomy.stackexchange.com/questions/21484/… help you? $\endgroup$ – B--rian Jan 22 at 9:32
  • 2
    $\begingroup$ No, I saw the website cleardarksky.com and it's too confusing. $\endgroup$ – bobsmith76 Jan 22 at 10:14

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