Bortle scale: A way to assess and monitor the urban nightsky

November 26, 2021Open Access

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Key Points

Assess and monitor the urban night sky quality in Metro Manila using the Bortle scale.
Conducted surveys among observers in Metro Manila and surrounding provinces.
Categorized night sky brightness into Bortle scale levels from BS6 to BS7.
Analyzed responses on light pollution visibility and conditions.
Compared urban and suburban sky observations.
Majority of respondents in Metro Manila rated their night sky as BS7, indicating high light pollution.
Significant percentages from suburban areas rated their skies as BS6, showing brighter conditions.
Darker skies were observed in provinces further from Metro Manila, showing lower Bortle scale ratings.

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Examines urban night sky brightness in Metro Manila, revealing significant light pollution effects.

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Cruz Ruby-Ann Dela (2021) studied this question.

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