Daily Korean records can date the 1452/53 eruption to the month

The tree rings put the eruption between late summer 1452 and early summer 1453. Tested 25 October 2026 with the Annals of the Joseon Dynasty (scripts/sillok_days.py and scripts/sillok_sky.py), read day by day for 1447 to 1458, about 3,600 days with entries.

Result: the Annals of this period never describe the colour or brightness of the Sun: not one dim, red or lightless Sun in twelve years. They record only 3 lunar eclipses in that time, though many more were visible from Korea. The total eclipse of 16 November 1453 is there, but only as 'the Moon was totally eclipsed' (月食旣), with no word on how dark it was. Fog entries cluster in 1451 to 1454 (14 entries, including a 'dark fog, people unrecognisable a few steps away, four days in all' from 20 November 1452 and arm's-length fogs with rime ice in December 1452 to February 1453), but they start in 1451, before the eruption, and appear only under Kings Munjong and Danjong (none in 1447 to 1449 or 1457 to 1458), so they track what the court chose to write down, not the volcano. Sun haloes swing from 1 a year to 36 a year in the same way.

Verdict: the Annals are too thin a sky record in the 1450s to date this eruption. Ming sources also give no dim Sun for 1452 to 1453, only cold: 40 days of snow in Jiangxi in spring 1453 and the frozen winter of 1453 to 1454.

Kuwae check: in 1459, after one of the largest eruptions of the millennium, the Annals also record no dim or red Sun and only a few haloes. Confirms the Annals of this period cannot see a volcanic veil.