Chinese animal hours

The Chinese zodiac is also used to label times of day, with each sign corresponding to a "large-hour" or shichen, which is a two-hour period (24 divided by 12 animals). It is therefore important to know the exact time of birth to determine it. The secret animal is thought to be a person's truest representation, since this animal is determined by the smallest denominator: a person's birth hour. As this sign is based on the position of the sun in the sky and not the time of your local clock, it is important to compensate for daylight saving time. However, some online systems already compensate for daylight saving time, and astrologers may compensate your time for you oblivious to the fact that you've compensated it yourself, leading to an inaccurate reading.

Within the Four Pillars, the hour is the pillar representing information about one's kids and contributions to the world or later life.

23:00 – 01:00: Rat
01:00 – 03:00: Ox
03:00 – 05:00: Tiger
05:00 – 07:00: Rabbit
07:00 – 09:00: Dragon
09:00 – 11:00: Snake
11:00 – 13:00: Horse
13:00 – 15:00: Goat
15:00 – 17:00: Monkey
17:00 – 19:00: Rooster
19:00 – 21:00: Dog
21:00 – 23:00: Pig

http://en.wikipedia.org/wiki/Chinese_zodiac#Hours