Case file · Cosmic event
The great red aurora of 1770
On 17 September 1770 a red aurora filled the northern sky across Japan; a Kyoto drawing shows red rays fanning out above the horizon.
1770 CE · 35.01, 135.77 · status: official
The account
Diaries from all over Japan describe the glow, and Kataoka and colleagues used them in 2017 to rank the storm among the strongest on record, comparable to the Carrington event of 1859.