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The Akan people (a Kwa group of West Africa) appear to have used a traditional system of timekeeping based on a six-day week (known as ''nnanson'' "seven-days" via inclusive counting). The Gregorian seven-day week is known as ''nnawɔtwe'' (eight-days). The combination of these two system resulted in periods of 42 days, known as ''adaduanan'' (meaning meaning "forty days").〔 ==Nnanson== The composition or construction of the Adaduanan cycle appears to be based on an older six-day week.〔 〕 The six-day week is referred to as ''Nnanson'' (literally seven-days) and reflects the lack of zero in the numbering systems; the last day and the first day are both included when counting the days of a week. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Akan calendar」の詳細全文を読む スポンサード リンク
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