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Your Daily AstrologyEphemeris & Almanac
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How two signs actually meet

Compatibility is not a mood. Two signs sit a fixed number of degrees apart on the wheel, and that angle — plus their elements and their mode of operating — is what astrologers are reading when they say two people “work”.

First sign
Second sign
97PER CENT

Rare alignment

Leo·Sagittarius

Aspect120° apart

△Trine

shared element; the current runs the same way in both of you.

ElementsFire + Fire

Two fires burn hot and burn fast. Momentum is never the problem; the brakes are.

ModeFixed + Mutable

Fixed meets mutable. Different tempos: one of you sets the pace and the other decides how long it lasts. This is usually the pairing's quiet advantage.

Deep Synastry Analysis

Comparing more than Sun signs?

Cross-reference natal Venus, Mars, and Moon aspects between two birth charts for exact relational chemistry.

Full Synastry Chart
The aspects, briefly

What the symbols mean

☌Conjunction0°

Same sign. Instant recognition, and nowhere to hide.

⚹Sextile60°

Compatible elements. Easy company, low friction.

□Square90°

Same mode, clashing element. Productive tension.

△Trine120°

Same element. The current runs the same way.

☍Opposition180°

Opposite ends of one axis. Magnetic, and blind-spotted.

Synastry Fundamentals

Frequently asked questions

How is zodiac compatibility calculated?

Zodiac compatibility is calculated from the exact geometric angular distance between signs on the 360-degree celestial wheel (conjunctions at 0°, sextiles at 60°, squares at 90°, trines at 120°, and oppositions at 180°), cross-referenced with their elemental triplicity (Fire, Earth, Air, Water) and quadruplicity mode (Cardinal, Fixed, Mutable).

What is synastry in astrology?

Synastry is the comparative study of two individual birth charts. By overlaying planetary coordinates, synastry evaluates relational chemistry, emotional reciprocity (Moon aspects), romantic affection (Venus aspects), and friction or communication patterns (Mars and Mercury aspects).

Are opposite zodiac signs compatible?

Opposite signs sit 180 degrees apart across the same celestial axis (such as Aries-Libra or Taurus-Scorpio). They share compatible elements (Fire-Air or Earth-Water) and the same modality, creating intense magnetic attraction and mutual balancing, though requiring intentional communication to navigate blind spots.