Xīnhài Gémìng de " xīnhài ", jiùshì yòng gānzhī biǎoshì de niánfèn.
The "Xinhai" in the Xinhai Revolution is a year named in the stem-and-branch system.
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culture
The ten 天干 'Heavenly Stems' (甲, 乙, 丙 and so on) pair with the twelve 地支 'Earthly Branches' (子, 丑, 寅 and so on) to make sixty names, from 甲子 to 癸亥, and then the cycle starts again. That is why a 60th birthday is called 花甲.