Astrology Compatibility Calculator

Sun-sign compatibility uses two building blocks of the chart: element (Fire, Earth, Air, Water) and modality (Cardinal, Fixed, Mutable). Signs that share an element harmonize naturally; complementary elements — Fire with Air, Earth with Water — energize each other; signs that share a modality without sharing an element tend to grind against each other; everything else is a workable middle ground.

No. Sun-sign compatibility is one note out of about a dozen in a full chart. Plenty of long, happy relationships are between signs that score low on a sun-sign-only model — because Venus, Mars, Moon, and the rising sign do most of the actual relational work. Treat the score as a conversation starter, not a verdict.

Because real people aren't their sun sign. Two sun signs being elementally clashy just means the default settings disagree — communication style, pace, what they prize. Couples who thrive past that usually have synastry elsewhere in the chart, or they've simply learned each other's languages.

Not for sun-sign compatibility — only the date matters, since the sun moves slowly. For deeper compatibility (Moon, Venus, Mars, rising) you'd want exact birth time and place for both people, the way the Birth Chart calculator works.