These can be ascertained by comparing the horoscope of a companion to your own natal chart. When comparing, take note of whether your companion has a predominance of planets in one of the elements, or if there are more than four planets in any one element.
By and large, people are more compatible when their natal planets fall into compatible elements. Fire and air are complementary elements, while earth and water are incompatible. That is, if your natal planets are predominantly in fire signs, you are more likely to be compatible with someone whose natal planets are predominantly in air signs. If the majority of your companion’s planets are in earth signs, you can anticipate a variety of difficulties depending on the elements involved.
Additionally, it is critical to note how many of your planets are in cardinal, fixed, or mutable signs, as well as the positions of your companion’s planets. A planet’s predominance in one quality (i.e., five or more planets in a cardinal, fixed, or mutable sign) indicates how someone will behave in a relationship.
Now it’s critical to note how your planets and those of your companion are distributed among the masculine and feminine signs. The majority of people have a five-to-five, or six-to-four, masculine-to-feminine ratio. If both you and your companion have the normal planet ratios, you should have no difficulty getting along. You can work things out even if one of you has a seven-to-three gender ratio and the other has a four-to-six gender ratio.
If you and your companion have a difference of one or two planets in masculine (or feminine) signs, you should have no difficulty establishing a compatible relationship. Even if there is a three-planet discrepancy, you can still work things out.
However, if you and your companion share more than three planets in the same gender, you will both have to work extremely hard to maintain a relationship. The reason for this is that the aggressive behavior of the dominantly masculine individual will threaten and harass the reserved, security-oriented feminine individual.
If both individuals are dominated by the same gender (masculine or feminine), they will have similar perspectives and approaches to life. This may initially create a strong sense of compatibility between them. They will, however, quickly develop a desire for the stimulation that comes with defending mildly divergent points of view. They will have to seek assistance from another source to meet that need.