2027 Forecast

Synastry aspect · 90° · orb 8°

Mars Square Neptune Synastry

Mars square Neptune in synastry means one partner's Mars sits about 90° from the other's Neptune (orb ±8°), an angle read as friction. It turns up in 9.19% of couples born within five years of each other.

Each side on its own first: Mars in a birth chart, Neptune in a birth chart and birth chart calculator.

In couples
9.19% about 1 in 11
Either way round
17.42% both ways: 0.96%
Angle
90° 3 signs apart · orb ±8°
Birth time
Not needed the date sets it

Simulation of 3 million couples, NASA JPL DE440.

The same aspect with one of these planets: Jupiter square Mars, Mars square Node, Mars square Venus, Lilith square Mars, Jupiter square Neptune, Lilith square Neptune, Neptune square Pluto and Neptune square Sun.

Mars Square Neptune Synastry: Meaning and How Common It Is

Checked against chance

How common is Mars square Neptune in synastry?

Mars square Neptune, counted three ways
Mars square Neptune, counted three ways Mars square Neptune, counted three ways: Couples ≤ 5 yrs apart 9.19%, Any two people, 1940–2010 8.89%, Planets spread evenly 8.89%. Couples ≤ 5 yrs apartCouples ≤ 5 yrs apart: 9.19%9.19%Any two people, 1940–2010Any two people, 1940–2010: 8.89%8.89%Planets spread evenlyPlanets spread evenly: 8.89%8.89%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com Couples ≤ 5 yrs apartCouples ≤ 5 yrs apart: 9.19%9.19%Any two people, 1940–2010Any two people, 1940–2010: 8.89%8.89%Planets spread evenlyPlanets spread evenly: 8.89%8.89%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com

Couples run above an even spread by 0.3 points. The age gap changes little: 8.3% to 9.32% at any gap up to 40 years.

How the odds are calculated →

By sign

Which signs make Mars square Neptune, generation by generation

Mars square Neptune, generation by generation: the Mars signs that make it
Mars square Neptune, generation by generation: the Mars signs that make it Neptune in Virgo (1928–43): Mars in Gemini or Sagittarius; Neptune in Libra (1942–57): Mars in Cancer or Capricorn; Neptune in Scorpio (1955–70): Mars in Leo or Aquarius; Neptune in Sagittarius (1970–84): Mars in Virgo or Pisces; Neptune in Capricorn (1984–98): Mars in Aries or Libra; Neptune in Aquarius (1998–2012): Mars in Taurus or Scorpio. Mars’ sign that makes itAriTauGemCanLeoVirLibScoSagCapAquPisNeptune in Virgo1928–43Neptune in Virgo 1928–43: Mars in AriesNeptune in Virgo 1928–43: Mars in TaurusNeptune in Virgo 1928–43: Mars in Gemini — forms itNeptune in Virgo 1928–43: Mars in CancerNeptune in Virgo 1928–43: Mars in LeoNeptune in Virgo 1928–43: Mars in VirgoNeptune in Virgo 1928–43: Mars in LibraNeptune in Virgo 1928–43: Mars in ScorpioNeptune in Virgo 1928–43: Mars in Sagittarius — forms itNeptune in Virgo 1928–43: Mars in CapricornNeptune in Virgo 1928–43: Mars in AquariusNeptune in Virgo 1928–43: Mars in PiscesNeptune in Libra1942–57Neptune in Libra 1942–57: Mars in AriesNeptune in Libra 1942–57: Mars in TaurusNeptune in Libra 1942–57: Mars in GeminiNeptune in Libra 1942–57: Mars in Cancer — forms itNeptune in Libra 1942–57: Mars in LeoNeptune in Libra 1942–57: Mars in VirgoNeptune in Libra 1942–57: Mars in LibraNeptune in Libra 1942–57: Mars in ScorpioNeptune in Libra 1942–57: Mars in SagittariusNeptune in Libra 1942–57: Mars in Capricorn — forms itNeptune in Libra 1942–57: Mars in AquariusNeptune in Libra 1942–57: Mars in PiscesNeptune in Scorpio1955–70Neptune in Scorpio 1955–70: Mars in AriesNeptune in Scorpio 1955–70: Mars in TaurusNeptune in Scorpio 1955–70: Mars in GeminiNeptune in Scorpio 1955–70: Mars in CancerNeptune in Scorpio 1955–70: Mars in Leo — forms itNeptune in Scorpio 1955–70: Mars in VirgoNeptune in Scorpio 1955–70: Mars in LibraNeptune in Scorpio 1955–70: Mars in ScorpioNeptune in Scorpio 1955–70: Mars in SagittariusNeptune in Scorpio 1955–70: Mars in CapricornNeptune in Scorpio 1955–70: Mars in Aquarius — forms itNeptune in Scorpio 1955–70: Mars in PiscesNeptune in Sagittarius1970–84Neptune in Sagittarius 1970–84: Mars in AriesNeptune in Sagittarius 1970–84: Mars in TaurusNeptune in Sagittarius 1970–84: Mars in GeminiNeptune in Sagittarius 1970–84: Mars in CancerNeptune in Sagittarius 1970–84: Mars in LeoNeptune in Sagittarius 1970–84: Mars in Virgo — forms itNeptune in Sagittarius 1970–84: Mars in LibraNeptune in Sagittarius 1970–84: Mars in ScorpioNeptune in Sagittarius 1970–84: Mars in SagittariusNeptune in Sagittarius 1970–84: Mars in CapricornNeptune in Sagittarius 1970–84: Mars in AquariusNeptune in Sagittarius 1970–84: Mars in Pisces — forms itNeptune in Capricorn1984–98Neptune in Capricorn 1984–98: Mars in Aries — forms itNeptune in Capricorn 1984–98: Mars in TaurusNeptune in Capricorn 1984–98: Mars in GeminiNeptune in Capricorn 1984–98: Mars in CancerNeptune in Capricorn 1984–98: Mars in LeoNeptune in Capricorn 1984–98: Mars in VirgoNeptune in Capricorn 1984–98: Mars in Libra — forms itNeptune in Capricorn 1984–98: Mars in ScorpioNeptune in Capricorn 1984–98: Mars in SagittariusNeptune in Capricorn 1984–98: Mars in CapricornNeptune in Capricorn 1984–98: Mars in AquariusNeptune in Capricorn 1984–98: Mars in PiscesNeptune in Aquarius1998–2012Neptune in Aquarius 1998–2012: Mars in AriesNeptune in Aquarius 1998–2012: Mars in Taurus — forms itNeptune in Aquarius 1998–2012: Mars in GeminiNeptune in Aquarius 1998–2012: Mars in CancerNeptune in Aquarius 1998–2012: Mars in LeoNeptune in Aquarius 1998–2012: Mars in VirgoNeptune in Aquarius 1998–2012: Mars in LibraNeptune in Aquarius 1998–2012: Mars in Scorpio — forms itNeptune in Aquarius 1998–2012: Mars in SagittariusNeptune in Aquarius 1998–2012: Mars in CapricornNeptune in Aquarius 1998–2012: Mars in AquariusNeptune in Aquarius 1998–2012: Mars in PiscesSource: NASA JPL DE440 ingressesastrohot.com

Born 1928–43, with Neptune in Virgo? Then a partner’s Mars in Gemini or Sagittarius makes the square.

To check it by degree: Neptune at 10° Virgo makes the square with Mars anywhere from 2° to 18° of Gemini or Sagittarius — the 90° angle give or take 8°. The chart goes by sign, but the square also forms across a sign line: Neptune at 1° Virgo and Mars at 29° Scorpio are 88° apart, a sextile by sign.

Years are first entry to final exit, so neighboring rows overlap where Neptune stepped back on a retrograde. Source: NASA JPL DE440.

Between two people

What does Mars square Neptune mean in synastry?

Anger goes underground. The Mars person feels the Neptune person is slippery or passive, while the Neptune person feels bulldozed and withdraws. Desire can be idealized one day and deflated the next.

The usual mistake

Where does Mars square Neptune usually go wrong?

Anger goes underground. The Mars person pushes, the Neptune person slips away, and resentment leaks out as sarcasm, silence or disappointment.

Over time

How Mars square Neptune plays out over time

  1. Early on. The Mars person is drawn to the Neptune person's mystery and frustrated by their vagueness.
  2. Under pressure. Anger goes underground and leaks out as sarcasm or withdrawal.
  3. Years in. It works when conflicts are named directly and agreements are clear.

Mars and Neptune at other angles

At any angle: One person's Mars — drive, desire and anger — meets the other's Neptune — dreams, ideals and evasion. Energy and imagination combine, which can inspire romance and art or dissolve into confusion about what either person actually wants.

The square among the Mars–Neptune angles, % of couples
The square among the Mars–Neptune angles, % of couples The square among the Mars–Neptune angles, % of couples: Sextile 60° 6.21%, Square 90° 9.19%, Trine 120° 8.8%, Opposition 180° 4.51%. Sextile 60°Sextile 60°: 6.21%6.21%Square 90°Square 90°: 9.19%9.19%Trine 120°Trine 120°: 8.8%8.8%Opposition 180°Opposition 180°: 4.51%4.51%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com Sextile 60°Sextile 60°: 6.21%6.21%Square 90°Square 90°: 9.19%9.19%Trine 120°Trine 120°: 8.8%8.8%Opposition 180°Opposition 180°: 4.51%4.51%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com
Opposition 180° · 4.51% of couples Trine 120° · 8.8% of couples Sextile 60° · 6.21% of couples

Next to Mars square Neptune in our list of 382, which runs from the most asked-about down.

Node trine Pluto 120° · 9.08% of couples Moon square Sun 90° · 8.89% of couples Pluto sextile Venus 60° · 6.79% of couples Moon square Saturn 90° · 8.88% of couples

Cite this page

AstroHot. “Mars Square Neptune Synastry: Meaning and How Common It Is.” Accessed October 28, 2026. https://astrohot.com/synastry/aspects/mars-square-neptune/

For Wikipedia {{cite web |title=Mars Square Neptune Synastry: Meaning and How Common It Is |url=https://astrohot.com/synastry/aspects/mars-square-neptune/ |website=AstroHot |access-date=2026-10-28}}