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dawn
Dawn (from an Old English verb ''dagian'' "to become day") is the time that marks, depending on the specific usage, the beginning of the twilight before sunrise,〔The Random House College Dictionary, "dawn".〕〔(A note on sunrise, sunset and twilight times ) from HM Nautical Almanac Office, The United Kingdom Hydrographic Office. Quoting:
There is no general agreement on a precise definition of "dawn"; it is sometimes even identified with sunrise itself. If, however, it is interpreted as the time of "first light", dawn corresponds to a depression between 18° and 12° but it is not possible to be more precise'.〕 the period of the pre-sunrise twilight〔Wiktionary, accessed 25 October 2015, ()〕 or the time of sunrise.〔〔 When identified as the beginning of or the period of twilight, it is recognized by the presence of weak sunlight, while the Sun itself is still below the horizon.
==Types of dawn==
(詳細はdegrees) below the horizon, in the morning:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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