Sun/Moon Calculator Reference
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Brian B.'s Climate Blog: Daylight-Twilight-Astronomical Maps
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Civil Twilight Calculator on the App Store
Civil Twilight Calculator by Aviametrix, LLC
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Civil Twilight for Watch on the App Store
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Civil Twilight Calculator on the App Store
GitHub - BinaryBirds/Sunlight: Calculate dawn, dusk, golden and blue hour times by using various algorithms.
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Sunrise equation - Wikipedia
trigonometry - How to calculate civil twilight timings? - Mathematics Stack Exchange
