Rat and Snake compatibility
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The Rat is the branch 子, Yang Water. The Snake is 巳, Yin Fire. Here is how the two branches meet in the tables Korean saju uses, and how their elements relate.
By the tables, the Rat and the Snake have none of the main combinations or clashes. The pair is read mostly through the elements.
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Branches: 子 and 巳
子 and 巳 have none of the main combinations or clashes in the tables.
Elements: Water and Fire
Water controls Fire in the controlling cycle. The Rat side tends to set the frame and the Snake side tends to feel it. Read gently it is structure, read harshly it is pressure. Agreeing who decides what usually helps.
子 is Yang and 巳 is Yin: one of each.
How to read this
A zodiac sign is one character out of eight in a saju chart. For two people, the birth-day pairs, the balance of elements and timing usually say more than the signs do. Treat this page as a tendency, for fun and self-reflection, not a verdict on anyone.

A sign is just one character
Two full charts have sixteen. Enter your birthday, then theirs, and the Moon Rabbit works out your compatibility score for free, on your device.
Questions
Are the Rat and the Snake compatible?
By the tables, the Rat and the Snake have none of the main combinations or clashes. The pair is read mostly through the elements. It is one character each, so treat it as a tendency. The full charts of both people say more.
Which signs are traditionally closest to the Rat and the Snake?
By the tables, the Rat’s closest partner (six harmony) is the Ox and its three-sign teammates are the Monkey and Dragon. For the Snake, the closest partner is the Monkey and the teammates are the Rooster and Ox.
Is zodiac compatibility the same as saju compatibility?
No. Zodiac compatibility compares only the two birth-year signs. Saju compatibility compares both full charts, especially the birth-day pairs and how the elements fill each other in. SajuBunny shows that score for free.