The Earthly Branches reference article from the English Wikipedia on 24-Apr-2004
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Earthly Branches

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The Earthly Branches (Chinese: 地支; pinyin: dìzhī) is an ancient Chinese numeral system now uncommon, except when used in conjunction with the Heavenly Stems in the traditional calendar and Taoism. There are twelve phonetic characterss in the system, each corresponding to an animal of the Chinese zodiac and a respective Chinese hour (modern day 2-hours):

  1. Zǐ (子): 11 PM - 1 AM ("Rat" hour)
  2. Chǒu (丑): 1 - 3 ("Ox" hour)
  3. Yín (寅): 3 - 5 ("Tiger" hour)
  4. Mǎo (卯): 5 - 7 ("Rabbit" hour)
  5. Chén (辰): 7 - 9 ("Dragon" hour)
  6. Sì (巳): 9 - 11 ("Snake" hour)
  7. Wǔ (午): 11 AM - 1 PM ("Horse" hour)
  8. Wèi (未): 1 - 3 ("Sheep" hour)
  9. Shēn (申): 3 - 5 ("Monkey" hour)
  10. Yǒu (酉): 5 - 7 ("Rooster" hour)
  11. Xū (戌): 7 - 9 ("Dog" hour)
  12. Hài (亥): 9 - 11 ("Pig" hour)

See also: Sexagesimal cycle