The main sign that everyone talks about -- a.k.a. your Zodiac sign -- is the Sun sign. The traits of your Sun sign are often the most obvious, and it's considered the key to your essential self. The Sun represents your primary needs and what you're moving toward fully embodying. You can start any astrological comparison by looking at the compatibility of your Sun signs.
When your Suns are compatible, it's easy to be together. You "get" each other, and can quickly establish a basis of shared experience.The Private Self (The Moon)
Just as important in any relationship is the Moon. The Moon is about emotions, inner needs and instinctual ways of coping. You'll want to compare Moon signs to get a sense of how these private energies harmonize. You can find out someone's Moon sign by entering their birth data in the birth chart generator.Love Chemistry: It's Elemental
An easy rule of thumb with compatibility is that the planets with Zodiac signs in the same element get along well. The fire signs are Aries, Leo and Sagittarius. The earth signs are Capricorn, Taurus and Virgo. The air signs are Libra, Aquarius and Gemini. The water signs are Cancer, Scorpio and Pisces.
And then there's harmony between planets with Zodiac signs in naturally compatible elements. These pairings are Fire-Air and Earth-Water.
Sometimes love is hard, but the rewards are great. This happens when there are clashing elements. These clashing pairings are Air-Water and Fire-Earth.
Some elements just don't click. Meeting at a party, they quickly forget each other's names, finding no common ground. The disharmonious (or indifferent) elements are earth-air and fire water.