''Nihon Shoki'' (日本書紀 Nihon shoki, The Chronicles of Japan), also known as the Nihongi (日本紀), is an early book about the history of Japan up to 720 A.D. It is one of the national history books which are together called the Rikkokushi.
This book is important to people who study the history of Japan because it has information about the early rulers not found in other books.
Dates in the Nihon Shoki before the late 7th century were likely recorded using the Genka calendar system.
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