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Winter Solstice

The winter solstice is the shortest day of the year. To usher in good luck and fortune and ward off evil spirits and illness, it is customary to eat kabocha (squash) and put yuzu (a type of citrus) in the bath.

Reference site
「コトバンク」
https://kotobank.jp/word/%E5%86%AC%E8%87%B3-103596#E5.A4.A7.E8.BE.9E.E6.9E.97.20.E7.AC.AC.E4.B8.89.E7.89.88
「All About」
http://allabout.co.jp/gm/gc/220635/2/