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What does the Bortle scale refer to?

spectrum of the stars

types of nebulae

brightness of the night sky

size of the planets

The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution. It was created by John E. Bortle in 2001.

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21%

10%

68%

0%

19

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12%

68%

6%

16

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10%

59%

10%

37

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12%

58%

5%

139

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12

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57

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24

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17

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308

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22%

45%

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22

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43%

7%

294

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42%

9%

98

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19

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40%

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