Synastry: compare two birth charts
Enter two people's birth details to see how the planets in one chart meet the planets in the other. We compare the Sun, Moon, Mercury, Venus and Mars of each person and list every classical aspect between them, tightest first. There is no overall score: the contacts are the reading.
How this works
Each chart is computed with our own engine at the given time and place (local noon if the time is unknown). We compare five planets per person: the Sun, the Moon, Mercury, Venus and Mars. A contact counts when two of them form one of the five classical aspects (conjunction, sextile, square, trine, opposition) within an orb of 6°, or 4° for the sextile, plus 1° when the Sun or the Moon is involved. Contacts are ranked by orb, tightest first.
Astrology is a symbolic language, not a science. Studies of large populations have found no link between astrological pairings and who stays together, so read these contacts as a way to talk about a relationship, not a forecast.