Chronology of naked-eye sunspot articles

Counts of '黑子 / 日中有黑 / 日有黑氣' articles by source and 50-year period.

170articles · Goryeosa, Jeolyo, Sillok, Ilgi

Key point

Naked-eye sunspot articles total 170 across the four sources (Goryeosa 32, Jeolyo 18, Sillok 50, Ilgi 70), at most a few dozen per 50-year period, so they are given as a chronology only. No correlation with solar-activity proxies is offered: at these counts it cannot be separated from recording practice.

Formula: Keyword counts (pre-registered pattern sunspot); no type coding. From 1.2.1 the Sillok is counted with the same pattern (keyword_hits_sillok_ext; Taejo–Cheoljong). Two undated Sillok articles (Injo) are in the article list (170) but not in the 50-year table, whose columns sum to 168.
How to read it: Counts are small, so only the distribution is shown: Goryeosa 32, Jeolyo 18, Sillok 50, Ilgi 70.
Caveats: Aurora candidates (赤氣, 白氣, 火光) are not a metric; their counts sit in a footnote — they cannot be separated from clouds and twilight.
External check: Yang, H.-J. et al. 2019, 'Solar activities and climate change during the last millennium recorded in Korean chronicles', JASTP 186: 139–146, doi:10.1016/j.jastp.2018.10.021 (abstract): 42 Goryeo and 13 Joseon records; Lee, E. H. et al. 2004, 'The sunspot and auroral activity cycle derived from Korean historical records of the 11th–18th century', Sol. Phys. 224: 373–386, doi:10.1007/s11207-005-5199-8, treats the same records (counts not checked against the paper).

Reliability card: exactExact count — read straight from the source XML
Keyword counts, no type coding. Aurora-candidate articles (赤氣白氣火光紫氣): Goryeosa treatise 37, Ilgi 227.

Period	Goryeosa treatise	Jeolyo	Sillok	Ilgi
1150–1199	12	10	0	0
1200–1249	4	4	0	0
1250–1299	2	1	0	0
1350–1399	14	3	0	0
1400–1449	0	0	1	0
1450–1499	0	0	4	0
1500–1549	0	0	4	0
1550–1599	0	0	6	0
1600–1649	0	0	16	1
1650–1699	0	0	2	2
1700–1749	0	0	12	28
1750–1799	0	0	3	22
1800–1849	0	0	0	12
1850–1899	0	0	0	5

Download CSV: g5_sunspot.csv