閏Chronology

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83097011101190168018001870 840–969980–11091120–11891200–16791690–17991820–1869

1

1

1

1

1

4

2

4

No year recorded 20

+14

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 ↗