Fig. 1.
Panel a: Seirinki (MS 16.28-11-11) in Kanazawa Tamagawa Library, with a description of “heaven’s split” in September 17, 1770 (Courtesy: Kanazawa Tamagawa Library). Panel b: Japanese auroral record on February 15, 1730: Arisawa Takesada Nenpu, v.2, f.55b-56a; MS toku 16.38-2-6 in Kanazawa Tamagawa Library (Courtesy: Kanazawa Tamagawa Library). This record is registered as J9 in our paper (see the Supplementary Information and Table 1).
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