Heavy day - 11th

Japanese: 重日 - じゅうにち

〘Noun〙 In the old calendar, this refers to the day of the snake, when the sun overlaps, and the day of the boar, when the yin overlaps. If this day was used for inauspicious events, it would be avoided as it would overlap, and it was also avoided to report bad things. Conversely, for auspicious events, it was advantageous to use that day as it would overlap, but it was avoided for marriages as it was taboo to overlap. 10 days. ※Engishiki (927) 11 "General affairs _to be reported by all domestic and foreign offices (omitted) Gonokami days (including the Empress and Crown Prince), as well as the first day of the month, important days, and other days _{should not} be reported as _inauspicious events. _"

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙古暦で陽が重なるという巳の日と、陰が重なるという亥の日をいう。この日を凶事に用いるとそれが重なるとして避け、また悪い事を奏聞するのを避けた。逆に吉事には、それが重なるとしてその日に用いることを利としたが、ただ婚姻は重なることを忌むので避けた。じゅうじつ。※延喜式（927）一一「凡内外諸司所_レ申庶務〈略〉御本命日〈中宮東宮亦同〉及朔日重日復日亦不_レ申_二凶事_一」

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