Four Pillars
The Four Pillars method can be traced back to the Han Dynasty (206 BC – AD 220), and is still much used in Feng Shui astrology and general analysis today. The Four Pillars or Columns chart is called such as the Chinese writing causes it to fall into columns. Each pillar or column contains a stem and a branch—and each column relates to the year, month, day and hour of birth. The first column refers to the year animal and element, the second to the month animal and element, the third to the day animal and element, and the last to the hour animal and element.
Within the ‘Four Pillars’, the Year column purports to provide information about one’s ancestor or early age, and the Month column about one’s parents or growing age. The Day column purports to offer information about oneself (upper character) and one’s spouse (lower character) or adult age, and the Hour column about children or late age.
http://en.wikipedia.org/wiki/Chinese_zodiac#Compatibility
First Tier:
The Year of Birth
This is a Sign and Element Combination, so it equals out 12 signs x 5 elements = 60 year cycle, so it means that another person like your year wont be born for another 60 years :)
For elements and more years: here
Wood – ruled by Jupiter
Fire – ruled by Mars
Earth – ruled by Saturn
Metal – ruled by Venus
water – ruled by Mercury
Second Tier:
The Month of Birth
Tiger : Feb 4 – Mar 5
Rabbit: Mar 6 – Apr 4
Dragon: Apr 5 – May 4
Snake: May 5 – June 5
Horse: Jun 6 – Jul 6
Goat: Jul 7 – Aug 06
Monkey: Aug 7 – Sep 7
Rooster: Sep 8 – Oct 7
Dog: Oct 8 – Nov 6
Pig: Nov 7 – Dec 6
Rat: Dec 7 – Jan 5
Ox: Jan 6 – Feb 3
Third Tier:
The Day of Birth
TBA
Fourth Tier:
The Hour of Birth

23:00 – 00:59: 子 Rat
01:00 – 02:59: 丑 Ox
03:00 – 04:59: 寅 Tiger
05:00 – 06:59: 卯 Rabbit
07:00 – 08:59: 辰 Dragon
09:00 – 10:59: 巳 Snake
11:00 – 12:59: 午 Horse
13:00 – 14:59: 未 Goat
15:00 – 16:59: 申 Monkey
17:00 – 18:59: 酉 Rooster
19:00 – 20:59: 戌 Dog
21:00 – 22:59: 亥 Pig
Compatibility



Compatibility Grid

(c) Watcher, S, 2014.Chinese Astrology’s Four Tier Astrology. [ONLINE] Available at: http://freesiderealastrology.wordpress.com/2014/01/28/chinese-astrologys-four-tier-astrology/.
References
Paranormality, 2014. Chinese Star Signs . [ONLINE] Available at: http://www.paranormality.com/chinese_star_signs.shtml. [Accessed 20 June 2014].
Wikipedia, the free encyclopedia. 2014. Chinese zodiac – Wikipedia, the free encyclopedia. [ONLINE] Available at: https://en.wikipedia.org/wiki/Chinese_Zodiac. [Accessed 20 June 2014].
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