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astronomical twilight

astronomical twilight

times of the day when the sun is 12 to 18 degrees below the horizon

en-US/ˌæstɹəˈnɑmɪkəl tˈwaɪˌlaɪt/

en-GB/ˌæstɹəˈnɒmɪkl ˈtwaɪlaɪt/

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