When two people first meet, the chance of them having a compatible relationship will always depend on how their character, needs and personality traits will blend and their ability to give and take with each other in either, or both, social or business situations.
You can determine compatibility by comparing natal charts.
When doing a comparison, the first thing you should look at is whether they have a predominance of planets in one of the elements – a “predominance” is more than four planets in one element (the elements being Earth, Fire, Air or Water). A predominance of planets in one element will tell you something about their dominating characteristics and what they will bring to a relationship.
Anyone with a predominance of Fire signs (Aries, Leo, Sagittarius) will bring an impulsive enthusiasm to the relationship.
Someone with a predominance of Earth signs (Taurus, Virgo, Capricorn) will have a stabilizing influence on the relationship.
A person with a predominance of Air signs (Gemini, Libra, Aquarius) puts the relationship on an intellectual level.
A person with a predominance of Water signs (Cancer, Scorpio, Pisces) will literally flood the relationship with deep emotional actions and reactions.
Generally speaking, people are more likely to be compatible with each other when their natal planets fall into compatible elements, which are Earth with Water and Fire with Air. This means that if you have a predominance of natal planets in the Fire signs, you are more likely to have a compatible and successful relationship with someone who has a predominance of natal planets in the Air signs. If your companion’s planets are mostly in the Earth signs, you can expect assorted difficulties depending on which elements are involved.
Another important factor is to check how many of your and your partner’s/friend’s planets are in the Cardinal, Fixed, and Mutable signs. These are called “Qualities”.
A predominance of planets in one Quality (i.e. five or more planets in a Cardinal, Fixed, or Mutable sign) tells you how someone is likely to act in a relationship. For example:
A predominance of Cardinal signs (Aries, Cancer, Libra, Capricorn) makes you anxious to see things get started.
Someone with a predominance of Fixed signs (Taurus, Leo, Scorpio, Aquarius) is more likely to be stubborn and unyielding in a relationship.
A predominance of Mutable signs (Gemini, Virgo, Sagittarius) usually results in people who will be adaptable and willing to make compromises.
Finally, note how your and your companion’s planets are spread among the masculine and feminine signs.
The Masculine signs are: Aries, Gemini, Leo, Libra, Sagittarius, and Aquarius.
The Feminine signs are: Taurus, Cancer, Virgo, Scorpio, Capricorn, and Pisces.
Most people have an even balance between masculine and feminine of five:five, or six:four. If you and your companion each have a normal ratio of planets, you should get along with each other. You should have no trouble working through things even when one of you has a gender ratio of seven:three while the other has a four:six ratio.
The trouble may come if there are more than three planets between you and your companion, in one gender. You will both need to work very hard to maintain the relationship. The reason is that the dominantly masculine person’s aggressive behavior will make the more passive and reserved feminine signs feel threaten and harassed.
If both of you in the friendship or relationship have a predominance of the same gender, whether it is masculine or feminine they are far more likely to share the same viewpoint and approach to life. Initially, this can be reassuring and give them a strong feeling of compatibility. However, they will soon feel a need for the kind of stimulation that comes from having mildly different points of view.
Unfortunately, anyone dominated by a single gender (eight of more planets either masculine of feminine) may find it difficult to establish a comfortable relationship.