What are synastry aspects?

Angles between a planet in one chart and a planet in the other. Five angles are read as significant, each with a tolerance called an orb.

How often does an aspect happen by chance?

It is calculable: two times the orb divided by 360. A square with an 8-degree orb occurs in 8.89% of random pairings, a conjunction in 4.44%. Most charts contain several aspects for purely arithmetical reasons.

Why do Pluto and Neptune aspects mean less?

Because they move slowly — Pluto spends about 20 years in one sign. Everyone born within that window has it in the same place, so an aspect to it describes the age gap rather than the relationship. 40.1% of the combinations people search for involve at least one such planet.

Synastry aspects

All 382 combinations people search for — each with the figure no other site gives: how often that aspect turns up by chance.

Arithmetic, not interpretation

Every aspect has a base rate

An aspect is an angle with a tolerance called an orb, so the chance of hitting it at random is simply the size of the window divided by the circle: two times the orb over 360 degrees. Conjunctions and oppositions have one window, the rest have two.

Aspect	Angle	Orb	Odds by chance	Read as
Conjunction	0°	±8°	4.44%	fusion
Sextile	60°	±6°	6.67%	ease
Square	90°	±8°	8.89%	friction
Trine	120°	±8°	8.89%	flow
Opposition	180°	±8°	4.44%	polarity
Quincunx	150°	±3°	3.33%	mismatch

A square lands in 8.89% of random pairings — roughly one couple in eleven, with no meaning attached. A synastry comparison looks at dozens of planet pairs, so finding several aspects is the expected outcome, not a signal. That does not make the readings worthless; it means the interesting question is which aspects are tight rather than which exist.

Why a third of these describe your age, not your relationship

20 years Pluto spends about that long in one sign. Neptune 14, Uranus 7, Chiron 4.

40.1% of searched combinations involve at least one of those slow planets — 153 of 382.

35.1% of all search demand in this section goes to those combinations.

Everyone born inside a twenty-year window has Pluto in the same sign. So if your synastry shows Venus square Pluto, that configuration was fixed by the years you were both born in — it is a statement about the age gap, and it is shared with millions of other pairings with the same spacing.

Aspects between fast movers are different: the Moon changes sign every two and a half days, the Ascendant every two hours. Those are genuinely specific to two charts, and they are the ones worth weight.

118,170 searches a month across all of them

All 382 combinations

Mars o Venus 8,100 Mars s Pluto 4,000 Mars c Moon 3,620 Mars s Moon 3,190 Pluto s Venus 3,170 Lilith o Venus 3,070 Mars o Sun 2,450 Sun c Venus 2,440 Saturn s Sun 2,420 Moon c Pluto 1,940 Ascendant o Mars 1,900 Mars c Pluto 1,900 Node s Sun 1,860 Moon s Pluto 1,830 Saturn s Venus 1,760 Sun s Venus 1,740 Mars t Moon 1,600 Moon s Venus 1,460 Pluto s Sun 1,430 Moon o Venus 1,330 Mars s Sun 1,140 Pluto t Venus 1,070 Moon o Saturn 1,050 Moon t Pluto 1,020 Mercury s Moon 1,000 Moon o Sun 990 Node t Pluto 970 Moon s Sun 970 Mars s Neptune 790 Pluto s Venus 770 Moon s Saturn 770 Uranus s Venus 760 Uranus o Venus 750 Pluto t Sun 750 Mars o Neptune 740 Ascendant s Moon 670 Ascendant t Venus 660 Jupiter s Mars 630 Mars s Mercury 590 Mercury s Sun 590 Pluto s Saturn 590 Mars s Pluto 570 Ascendant t Mars 550 Jupiter s Sun 550 Node t Venus 540 Chiron s Node 530 Mars t Pluto 530 Moon s Neptune 530 Mars s Uranus 520 Lilith s Mars 520 Saturn t Sun 510 Mercury t Venus 510 Saturn t Venus 510 Moon t Neptune 480 Ascendant t Juno 480 Ascendant t Moon 460 Jupiter s Moon 460 Node s Venus 440 Mars s Moon 440 Mars o Saturn 430 Juno t Pluto 430 Sun s Venus 430 Neptune s Sun 430 Mars s Sun 420 Lilith t Mars 420 Mars s Venus 410 Moon s Sun 400 Ascendant s Chiron 390 Moon s Uranus 390 Mercury s Venus 390 Mercury s Pluto 390 Ascendant s Venus 390 Ascendant s Sun 380 Mars s Venus 380 Chiron s Saturn 370 Moon t Saturn 360 Moon s Venus 360 Lilith s Sun 340 Moon t Node 330 Mercury s Saturn 320 Pluto s Sun 320 Lilith s Venus 320 Pluto t Saturn 320 Ascendant t Pluto 320 Lilith t Sun 320 Mars o Uranus 320 Jupiter s Venus 320 Mars t Mercury 310 Lilith s Moon 310 Lilith t Moon 310 Ascendant s Mars 300 Moon s Node 300 Moon s Pluto 290 Mars t Neptune 290 Ascendant t Sun 290 Mercury o Venus 280 Mercury s Neptune 280 Lilith t Pluto 280 Neptune s Venus 260 Neptune c Saturn 260 Jupiter o Mars 260 Moon t Uranus 260 Chiron s Venus 260 Lilith t Venus 260 Ascendant s Saturn 260 Jupiter t Sun 260 Ascendant s Pluto 260 Ascendant s Venus 260 Node s Venus 260 Mercury s Venus 250 Jupiter s Pluto 250 Node s Pluto 240 Ascendant t Saturn 240 Node s Saturn 240 Mars s Node 230 Mercury t Pluto 230 Jupiter t Pluto 230 Mercury t Sun 230 Mars t Venus 230 Node t Sun 220 Neptune s Pluto 220 Lilith s Venus 220 Jupiter t Saturn 210 Saturn s Venus 210 Chiron t Moon 210 Neptune t Sun 210 Jupiter s Venus 210 Jupiter s Saturn 210 Ascendant s Mars 210 Ascendant s Lilith 210 Moon s Neptune 210 Jupiter s Moon 210 Node t Saturn 210 Mars t Node 210 Jupiter t Mars 200 Mercury t Saturn 200 Ascendant s Pluto 190 Ascendant t Lilith 190 Neptune s Sun 180 Jupiter s Mercury 180 Jupiter s Sun 180 Lilith s Sun 180 Jupiter s Mars 180 Juno t Venus 180 Jupiter t Mercury 180 Chiron s Moon 180 Ascendant o Sun 170 Pluto s Uranus 170 Saturn s Uranus 170 Ascendant o Saturn 170 Mars t Saturn 170 Venus s Vertex 170 Lilith o Mars 170 Chiron s Sun 170 Neptune s Saturn 170 Lilith s Pluto 170 Chiron s Mars 170 Mars s Neptune 160 Ascendant t Neptune 160 Mars s Uranus 160 Ascendant s Neptune 160 Ascendant s Sun 160 Mercury s Sun 160 Ascendant t Jupiter 160 Mercury s Moon 160 Jupiter s Neptune 160 Mars s Mercury 160 Neptune s Pluto 140 Juno s Venus 140 Chiron t Mars 140 Chiron s Pluto 140 Mars q Venus 140 Mercury t Neptune 140 Mercury t Moon 140 Neptune o Venus 140 Sun s Uranus 140 Node s Sun 140 Ascendant s Uranus 140 Moon s Uranus 140 Moon s Node 140 Lilith s Moon 140 Pluto s Uranus 140 Lilith s Pluto 140 Ascendant t Mercury 130 Ascendant s Jupiter 130 Sun t Venus 130 Moon t Venus 120 Chiron s Venus 120 Jupiter t Node 120 Juno t Sun 120 Mercury s Pluto 120 Jupiter t Lilith 120 Pluto s Saturn 120 Juno t Saturn 120 Lilith s Saturn 120 Mercury s Saturn 120 Lilith t Mercury 120 Neptune t Saturn 110 Moon s Saturn 110 Moon o Uranus 110 Juno t Mars 110 Mercury o Pluto 110 Sun s Vertex 110 Mars s Saturn 110 Jupiter s Uranus 110 Ascendant t Uranus 110 Jupiter s Node 110 Mars t Sun 110 Sun s Uranus 110 Lilith s Mercury 100 Lilith t Saturn 100 Juno t Node 100 Ascendant o Neptune 90 Jupiter t Uranus 90 Ascendant s Mercury 90 Uranus s Venus 90 Chiron t Saturn 90 Lilith s Mars 90 Saturn s Sun 90 Mars c Sun 90 Pluto o Venus 90 Venus t Vertex 90 Juno t Moon 90 Jupiter s Lilith 90 Lilith s Neptune 90 Pluto q Venus 90 Ascendant s Node 90 Neptune t Node 90 Jupiter s Mercury 90 Lilith t Neptune 90 Mars s Node 90 Saturn t Uranus 90 Moon s Vertex 90 Neptune s Node 80 Juno s Sun 80 Mercury t Node 80 Node t Uranus 80 Juno s Venus 80 Mercury s Node 80 Node s Pluto 80 Juno t Jupiter 80 Moon c Sun 80 Chiron s Mars 80 Mercury t Uranus 70 Ascendant s Lilith 70 Moon q Sun 70 Chiron o Mars 70 Sun t Uranus 70 Jupiter o Pluto 70 Ascendant t Node 70 Ascendant s Saturn 70 Node s Uranus 70 Moon c Venus 70 Juno s Pluto 70 Sun t Vertex 70 Pluto c Venus 70 Mercury s Neptune 70 Lilith s Uranus 70 Juno s Mars 70 Lilith t Uranus 70 Juno s Moon 70 Lilith t Node 70 Midheaven t Venus 60 Juno t Lilith 60 Node t Vertex 50 Ascendant o Node 50 Neptune s Venus 50 Moon c Saturn 50 Juno s Saturn 50 Mars t Vertex 50 Mars s Saturn 50 Venus s Vertex 50 Jupiter s Pluto 50 Moon t Vertex 50 Moon t Sun 50 Ascendant s Neptune 50 Ascendant s Jupiter 50 Chiron s Moon 50 Moon o Pluto 50 Jupiter s Neptune 50 Juno s Lilith 50 Sun q Venus 50 Jupiter c Moon 40 Ascendant s Moon 40 Ascendant t Chiron 40 Saturn q Venus 40 Mars o Moon 40 Node s Saturn 40 Saturn o Sun 40 Lilith s Node 40 Chiron s Jupiter 40 Ascendant s Mercury 40 Uranus t Venus 40 Node s Vertex 40 Pluto q Sun 40 Jupiter t Venus 40 Neptune t Venus 40 Moon q Venus 40 Chiron s Sun 40 Chiron s Mercury 40 Jupiter s Node 40 Ascendant t Vertex 40 Jupiter c Venus 40 Chiron s Lilith 40 Chiron t Jupiter 40 Mercury s Uranus 40 Chiron t Lilith 40 Midheaven s Venus 40 Pluto o Saturn 40 Mars q Moon 40 Mars q Sun 30 Lilith s Mercury 30 Jupiter s Uranus 30 Ascendant s Node 30 Pluto t Uranus 30 Midheaven s Sun 30 Juno s Node 30 Juno s Node 30 Jupiter o Sun 30 Juno s Sun 30 Jupiter t Moon 30 Chiron t Neptune 30 Juno s Moon 30 Mercury s Node 30 Neptune s Node 30 Ascendant s Uranus 30 Saturn s Uranus 30 Jupiter o Venus 30 Chiron t Mercury 30 Moon o Neptune 30 Jupiter s Lilith 30 Juno s Jupiter 30 Ascendant s Juno 30 Saturn t Vertex 30 Saturn s Vertex 30 Juno t Mercury 20 Jupiter c Saturn 20 Moon q Saturn 20 Ascendant s Vertex 20 Lilith s Vertex 20 Lilith o Moon 20 Sun o Uranus 20 Chiron s Neptune 20 Midheaven t Sun 20 Juno t Neptune 20 Ascendant s Juno 20 Chiron t Juno 20 Moon o Node 20 Juno s Pluto 20 Chiron o Saturn 20 Mercury c Sun 10 Mercury o Sun 10 Ascendant o Uranus 10 Mars q Pluto 10 Neptune s Saturn 0 Saturn c Venus 0 Chiron q Node 0 Moon c Uranus 0 Ascendant q Sun 0 Jupiter c Node 0 Jupiter o Uranus 0 Jupiter q Moon 0 Ascendant q Mars 0 Lilith s Saturn 0 Node q Venus 0 Node q Pluto 0 Chiron q Moon 0 Ascendant q Moon 0 Jupiter s Saturn 0 Mercury o Uranus 0 Juno q Jupiter 0 Chiron q Venus 0 Saturn q Sun 0 Chiron q Pluto 0 Sun c Uranus 0 Node q Saturn 0 Pluto o Uranus 0 Ascendant q Venus 0 Lilith q Venus 0 Pluto c Uranus 0 Jupiter q Saturn 0 Chiron q Uranus 0