The Heavenly Stems (tiāngān 天干) were the names of the ten suns, which may have designated world ages as did the Five Suns and the Six Ages of the World of Saint Augustine.
Geng Xin 庚辛 "The Geng and Xin Families" (5.10) recounts how two neighbors, figuratively named after the 7th and 8th Celestial stems, used different materials to construct fish ponds.
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