Two people are more than two signs.

A classic compatibility table asks one question: the angle between two people's Sun signs. Signs sharing an element (fire with fire, earth with earth) are called compatible, signs ninety degrees apart difficult, signs opposite complementary but tense. It is a shorthand, and as shorthands go it is not a bad one.

The problem is that the Sun is one placement out of roughly ten in a chart. You share a Sun sign with a twelfth of the population, and you do not have the same relationship with all of them. The table reduces everything knowable about two people to the month each was born in.

None of which means throwing the tables away. They are useful for starting a conversation and for naming a tendency. They are not an answer to "will this work", and the trouble begins when they are handed to someone who asked that question as though they were.

Tradition gives four placements priority in a relationship reading, and none of them is the Sun. The Moon shows what you need in order to feel safe, and what two people actually collide over is usually not values but how they settle each other. Venus describes what you find attractive and how you build closeness; Mars, how you pursue, how you begin, and how you get angry.

The Ascendant is the first impression: the manner someone meets before they know you. The first weeks of a relationship are largely two Ascendants reacting to each other; the later years lean steadily more on the Moon and Venus.

This is why two couples with identical Sun signs go completely differently. The Sun sign is the same in both; the Moons, Venuses, Mars placements and Ascendants are not, and the daily texture of a relationship is built exactly there.

There is no sign-to-sign compatibility table in the app, and there never was. Two birth charts are computed and the real aspects between them are extracted instead: your Venus to their Mars, your Moon to their Saturn, one by one, each with its orb.

The result is not compressed into a single percentage. It is reported on four separate axes — chemistry, mental connection, trust and long-term potential — because where a relationship is strong and where it is hard does not fit in one number. High chemistry with low trust, and low chemistry with high long-term potential, are different relationships, and a single figure shows them as the same one.

If you do not know your partner's birth time we say so and leave the house overlays out. Overlays need angles, and angles need a birth time. Naming what is missing beats quietly inventing half a synastry.

A compatibility reading is not a prediction. No chart can tell you whether a relationship will last, and anyone claiming otherwise is selling you something. Astrology's contribution here is more modest and more useful: naming where two people agree easily, and where they keep returning to the same argument.

That is also its best use. It gives language to "why do we always get stuck on this", and with that language the subject stops being a character flaw and becomes two different needs colliding. That does not rescue a relationship, but it does make it discussable.

Baby Astro stays inside that frame. It makes no guarantees about the future, names no date for a breakup or a wedding, and declines questions that demand certainty.