Birth chart compatibility: what astrology really says about love

Why your Sun sign is not enough

Sign compatibility charts are fun, but they reduce each person to just one of the ten bodies in their chart. Two Scorpios can have completely different Moons, Venus placements and Rising signs, and therefore opposite emotional needs.

Compatibility by element already gives a more nuanced picture: fire and air signs spark each other, earth and water signs nourish each other. But it remains partial as long as you only look at the Sun.

The Sun says a lot about your identity and what drives you. In love it matters, but other points speak more directly about how you love, desire, bond and share everyday life with someone.

The points to compare between two charts

• The Moon: emotional needs, what makes you feel safe, how you experience intimacy and daily life. Two Moons that understand each other make life together much easier.
• Venus: how you love, what attracts you, your tastes, the way you show affection. It says what you find beautiful and what makes you feel loved.
• Mars: desire, energy, how you act and handle conflict. Two very different Mars placements can create attraction, but also friction.
• The Rising sign: first impressions and the way you approach a relationship. It often explains love at first sight or, on the contrary, an initial wariness.
• Mercury: communication. Understanding each other effortlessly or having to explain everything makes a big difference in the long run.

Aspects between two charts

• One person's Venus on the other's Mars: one of the classic contacts of attraction.
• One person's Sun on the other's Moon: a complementarity often read as a sign of lasting harmony.
• One person's Saturn on the other's personal planet: a serious, committed and sometimes demanding bond.
• Contacts with the Ascendant or Descendant: they often bring a feeling that the meeting was meant to be.
• One person's Moon in tension with the other's Moon: different everyday needs, to be understood rather than ignored.

Comparing two charts is called synastry. It looks at the aspects that one person's planets make to the other's: conjunctions, trines and sextiles suggest natural affinities; squares and oppositions suggest tensions that can be stimulating or draining, depending on each person's maturity.

Timing matters too: transits

A relationship does not unfold under a frozen sky. Transits, meaning the movement of today's planets over the points of your chart, also color your love life. A Jupiter transit to your Venus or your Descendant is often linked with new encounters or a romantic revival. A Saturn transit to those same points tends to call for clarifying, committing or setting boundaries.

That is why two people can meet at the "right time" or the "wrong time": what counts is not only the affinity between two charts, but also the period each person is going through. These transits are calculated to the day.

The 7th house and the Descendant

In your own chart, the 7th house is the house of relationships and commitment. Its starting point, the Descendant, is exactly opposite the Rising sign. It describes the kind of partner you are drawn to, often qualities you find hard to recognize in yourself.

A Descendant in Aries often draws you toward frank, energetic partners; in Cancer, toward protective, home-loving people; in Capricorn, toward steady, responsible types. These are only tendencies, which the rest of the chart refines.

The planets in the 7th house, the sign on the Descendant and the position of its ruling planet give a detailed reading of what you expect from a relationship. To calculate it, you need your time of birth: without it, the Descendant remains unknown.

What astrology cannot tell you

Astrology is a symbolic framework, with no demonstrated predictive value. No chart guarantees that a relationship will succeed or fail. Couples with "difficult" charts stay together for a lifetime, and obvious astrological affinities are not enough without respect, dialogue and shared plans.

Used with perspective, it mainly helps you put words to differences: understanding that your partner needs time alone because their Moon asks for it, or that the way you argue comes from very different Mars placements. It is a tool for understanding, not a verdict.

Start by knowing yourself

Before comparing two charts, the most enlightening step is often to understand your own: your emotional needs, the way you love, what you look for in a partner, and the periods when your love life is most likely to shift.

That is the purpose of our Love and relationships report. It focuses on your personal chart (it does not compare two charts): your Moon, your Venus, your Mars, your 7th house and your Descendant, then the transits dated to the day over the period you choose. Over 1, 3 or 5 years, every month is analyzed one by one, up to 60 months.