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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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10%

70%

0%

20

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16

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61%

5%

158

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330

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104

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22

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295

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4742

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15%

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20

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20%

30%

40%

10

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