Goryeosa (History of Goryeo), original classical Chinese text on Chinese Wikisource: volumes 47 to 49 (astronomy) and 53 to 55 (five elements, the omen sections). Saved in sources/goryeosa_*.txt; dates converted with scripts/lunar_dates.py
How it connects
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Korean dim-Sun records track volcanic eruptions (Goryeo period, 918 to 1392)
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Two white vapours rose from the northwest and pierced the Sun, Korea, 27 January 1053
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A comet in the southern sky with a tail over 1 zhang, Korea, 25 February 1053
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Korea: nothing in the sky in the 8th month of 1098
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The Sun was blue and without light, then red like blood, Korea, early 1258
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A heavenly dog fell in front of the Ancestral Temple, Korea, 9 March 1261
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Red vapours in the northwest and across the sky, Korea, October and December 1262
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Red vapour in the west, Korea, 19 December 1268
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Red vapour across the whole sky, then a red glow bright as day, Korea, 23 and 26 March 1278
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A sunspot as big as a hen's egg, Korea, 31 August 1278