Synastry Aspects Between Planet Pairs
Synastry compares two birth charts; each planet pair page explains how a conjunction, sextile, square, trine, or opposition between those planets tends to feel between two people, with each planet assignment read in both directions.
Every planet pair
In the order people search for them. The figures are how often a random pair of birthdays forms each aspect between the two planets, counted with this site's engine.
| Pair | Any | Conjunction | Sextile | Square | Trine | Opposition |
|---|---|---|---|---|---|---|
| Venus-Mars | 25% | 3.3% | 5.0% | 6.6% | 6.7% | 3.4% |
| Moon-Mars | 29% | 3.8% | 5.9% | 7.7% | 7.8% | 3.9% |
| Moon-Venus | 29% | 3.9% | 5.8% | 7.8% | 7.8% | 3.9% |
| Venus-Pluto | 19% | 2.6% | 3.8% | 4.9% | 5.0% | 2.6% |
| Sun-Moon | 33% | 4.5% | 6.6% | 8.9% | 8.9% | 4.5% |
| Sun-Venus | 29% | 3.9% | 5.9% | 7.8% | 7.8% | 3.9% |
| Venus-Saturn | 23% | 2.9% | 4.5% | 6.1% | 6.1% | 3.1% |
| Mars-Saturn | 23% | 3.1% | 4.7% | 6.0% | 6.1% | 3.0% |
| Moon-North Node | 27% | 3.6% | 5.5% | 7.2% | 7.3% | 3.6% |
| Sun-Mars | 29% | 3.9% | 5.8% | 7.8% | 7.8% | 3.9% |
| Venus-Jupiter | 23% | 3.0% | 4.7% | 6.1% | 6.0% | 3.1% |
| Venus-North Node | 23% | 3.1% | 4.6% | 6.2% | 6.2% | 3.0% |
| Mars-Pluto | 19% | 2.8% | 3.8% | 5.2% | 4.7% | 2.3% |
| Moon-Pluto | 23% | 2.7% | 4.4% | 6.2% | 6.4% | 3.3% |
| Sun-Pluto | 23% | 3.2% | 4.5% | 5.9% | 6.3% | 3.0% |
| Sun-Saturn | 27% | 3.6% | 5.4% | 7.3% | 7.2% | 3.6% |
| Mars-Mars | 25% | 3.4% | 5.0% | 6.8% | 6.7% | 3.3% |
| Sun-North Node | 27% | 3.6% | 5.5% | 7.1% | 7.2% | 3.6% |
| Mars-Jupiter | 23% | 3.1% | 4.5% | 6.1% | 6.2% | 3.0% |
| Moon-Jupiter | 27% | 3.6% | 5.5% | 7.2% | 7.2% | 3.6% |
| Moon-Mercury | 29% | 3.9% | 5.8% | 7.8% | 7.8% | 3.9% |
| Moon-Saturn | 27% | 3.6% | 5.4% | 7.2% | 7.3% | 3.7% |
| Saturn-North Node | 21% | 2.7% | 4.1% | 5.5% | 5.6% | 2.8% |
| Mars-North Node | 23% | 3.0% | 4.6% | 6.2% | 6.1% | 3.1% |
| Moon-Moon | 33% | 4.5% | 6.7% | 8.9% | 9.0% | 4.4% |
| Venus-Neptune | 19% | 2.6% | 3.7% | 5.0% | 5.1% | 2.5% |
| Mars-Neptune | 19% | 2.5% | 3.7% | 5.1% | 4.8% | 2.5% |
| Mercury-Mars | 25% | 3.3% | 5.0% | 6.7% | 6.7% | 3.3% |
| Mercury-Venus | 25% | 3.3% | 5.0% | 6.6% | 6.7% | 3.3% |
| Moon-Neptune | 23% | 2.9% | 4.4% | 6.0% | 6.4% | 3.3% |
| Pluto-North Node | 17% | 2.1% | 3.2% | 4.5% | 4.5% | 2.6% |
| Sun-Sun | 33% | 4.4% | 6.7% | 8.9% | 9.0% | 4.4% |
| Venus-Uranus | 19% | 2.5% | 3.7% | 5.0% | 5.3% | 2.4% |
| Venus-Venus | 25% | 3.4% | 4.9% | 6.6% | 6.7% | 3.3% |
| Moon-Uranus | 23% | 2.8% | 4.5% | 6.3% | 6.1% | 3.2% |
| Sun-Mercury | 29% | 3.9% | 5.9% | 7.8% | 7.9% | 3.9% |
| Sun-Neptune | 23% | 3.0% | 4.6% | 6.0% | 6.2% | 3.2% |
The five aspects and their orbs
An orb is how far from the exact angle an aspect may be and still count. A pair of points allows the average of their two orbs, and a sextile three quarters of it. The Methodology page has the orb of every body.
| Aspect | Angle | Share of the orb | Nature | What it does |
|---|---|---|---|---|
| Conjunction | 0° | 100% | Depends on the planets | Two points from the two charts sit side by side, so their qualities blend into one. |
| Sextile | 60° | 75% | Harmonious | Two points work well together, though the link takes some effort to use. |
| Square | 90° | 100% | Challenging | Two points pull in different directions, creating friction that pushes both people to act. |
| Trine | 120° | 100% | Harmonious | Two points flow together with little effort, which feels natural and easy to take for granted. |
| Opposition | 180° | 100% | Challenging | Two points sit opposite each other, creating attraction and tension that call for balance. |
How the Pair Pages Work
Each page covers five aspects and what its planet pair represents between Person A and Person B. An aspect is the angle between two planets in their birth charts. Both directions means Person A's first planet to Person B's second, then Person A's second planet to Person B's first. A pair of the same planet reads one way. There are 37 pairs, including Venus and Mars, Moon and Venus, and Sun and Moon.
How Close an Aspect Must Be
The orb is the gap from an exact angle that still counts as an aspect. The calculator allows a gap equal to the average of the two planets' orbs; for a sextile, it allows three quarters of that average. A smaller gap makes a stronger link. The Sun's orb is 8 degrees, while Uranus's is 3 degrees. The allowed gap therefore depends on which two bodies form the aspect.
How Often Each Aspect Appears
In a computed sample of 600 random birthdays from 1950 to 2010, the calculator compared 359,400 pairs of birthdays using its own orbs. For any given planet pair, conjunctions and oppositions each appeared in about 2 in 100 to about 4 in 100 of the sample. Sextiles appeared in about 3 in 100 to about 7 in 100, while squares and trines each appeared in about 4 in 100 to about 9 in 100. Any of the five appeared in about 17 in 100 to about 33 in 100. These are shares of the sample, not claims about real couples.
Questions
What do synastry aspects describe?
They describe how two people's planets relate by angle in their birth charts. A pair page gives a way to read that contact between them, including how it tends to feel and what each person brings to the interaction.
Which planet pairs matter most in synastry?
No single pair matters most for every relationship. Each page describes one area of interaction, and the overall reading depends on the full set of contacts between the two birth charts.
How close must an aspect be to count?
It must fall within the allowed orb, measured as the gap from the exact angle. The calculator sets that gap from the two bodies' orbs, with a smaller allowance for a sextile; closer contacts count as stronger links.