億Chronology

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500580600700800960100011101200168017701800 510–579840–9591010–11091150–11991230–16791690–1769

1

2

22 +16

1

18 +12

1

1

1

1

4

2

1

1

1

2

3

1

2

2

1

1

1

1

1

1

No year recorded 5

Each crop stands at the decade of the first year its book's date gives; a date given only as before a year stands at that year. Dates come from the catalogues and editions cited with each record. The bars draw the whole span and their counts to scale; in the strip below them, fifty years or more with no crop are folded and marked. Japanese dates converted with HuTime ↗