What we calculate
Your month and day place you in one of the twelve tropical zodiac Sun signs, and in one of that sign’s three faces—the ten-degree thirds older astrologers called decans.
We then read the angle standing between the two signs: 0°, 30°, 60°, 90°, 120°, 150° or 180°. Those seven angles are the classical aspects, and each carries its own long-standing reading. The score weights that angle and then adjusts it by the angle between your two faces—which is why two people born under the same sign five weeks apart are not read identically here.
The displayed score is a friendly summary of that mix. It is not a probability, measurement or forecast. Scores run from the mid-thirties to the low nineties. A low one does not mean a worse pairing—it means less of it runs on shared instinct, so more of it has to be said out loud.
What we deliberately leave out
A full natal chart needs an accurate birth time, birthplace, astronomical ephemeris and much more interpretation. This tool asks for none of those, so it never presents itself as synastry or a complete chart reading.
How to use the result
Notice what feels recognisable. Question what does not. The useful part is the conversation you have after reading—not agreement with every sentence.