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Free composite chart calculator with interpretation: enter two birth dates to get midpoint composite Sun, Moon, Venus, Mars, Ascendant, and a compatibility score. Default (Capricorn + Gemini Suns): composite Sun Aries, 64% compatibility. We explain composite vs Davison and composite vs synastry clearly.
Last updated: May 24, 2026
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Compatibility
64%
Mixed — growth through communication
Days between births
896
Person 1 Sun
Capricorn
Person 2 Sun
Gemini
Composite Sun
Aries
Composite Moon
Sagittarius
Composite Venus
Taurus
Composite Mars
Pisces
Composite Ascendant · Sun–Moon · Venus–Mars
Gemini · Trine (same element) · Mixed aspect
Interpretation
Composite Sun in Aries (Fire · Cardinal) — the relationship’s shared identity and direction. Composite Moon in Sagittarius — emotional tone and what feels like “home” as a couple. Composite Venus in Taurus and Mars in Pisces blend Earth affection with Water drive. Individual Suns: Capricorn + Gemini.
Score 64% — workable with effort. Focus on communication when Aries purpose and Sagittarius emotional needs diverge.
Sun signs use birth-date ranges; Moon and other planets are simplified. Not a substitute for a full ephemeris or professional reading. Composite ≠ Davison (time/space midpoint).
Aries
~0° · Fire
64%
Trine (same element) · Mixed aspect
Capricorn + Gemini
Moon Sagittarius · Venus Taurus · Mars Pisces
Default · Cap + Gem
Sun Aries · 64%
Aries + Sagittarius Suns
Sun Aquarius · 56%
Synastry mode · Cancer + Aquarius
Sun Taurus · 52%
longitude = sign index × 30° + 15° (sign center)
composite ° = shorter-arc midpoint(longitude₁, longitude₂)
composite sign = floor(composite ° ÷ 30)
Worked: Capricorn 285° + Gemini 75° → diff along short arc 150° → midpoint 285° + 75° = 360° ≡ 0° Aries. Person 1 Moon Capricorn, Person 2 Moon Scorpio → composite Moon Sagittarius.
| Planet | In composite chart | Default example |
|---|---|---|
| Sun | Relationship identity, purpose, and shared direction | Aries |
| Moon | Emotional habits, safety needs, and daily comfort | Sagittarius |
| Ascendant | How the couple appears; first impression as a unit | Gemini |
| Venus | Affection style, values, and what you enjoy together | Taurus |
| Mars | Drive, conflict style, and how you pursue goals together | Pisces |
Relationship astrology uses two main lenses: synastry (how you affect each other) and composite (what the relationship itself is). Midpoint composites average planetary longitudes — the technique popularized in modern relationship work. Enter birth data above; read the output as conversation starters, not verdicts.
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