2027 Forecast

Synastry aspect · 90° · orb 8°

Mars Square Sun Synastry

Mars square Sun in synastry means one partner's Mars sits about 90° from the other's Sun (orb ±8°), an angle read as friction. It turns up in 8.88% of couples born within five years of each other.

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

In couples
8.88% about 1 in 11
Either way round
16.99% both ways: 0.77%
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: Mars square Mercury, Lilith square Mars, Juno square Mars, Mars square Venus, Sun square Uranus, Neptune square Sun, Lilith square Sun and Mercury square Sun.

Mars Square Sun Synastry: Meaning and How Common It Is

Checked against chance

How common is Mars square Sun in synastry?

Mars square Sun, counted three ways
Mars square Sun, counted three ways Mars square Sun, counted three ways: Couples ≤ 5 yrs apart 8.88%, Any two people, 1940–2010 8.89%, Planets spread evenly 8.89%. Couples ≤ 5 yrs apartCouples ≤ 5 yrs apart: 8.88%8.88%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: 8.88%8.88%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

Born the same year or 39 years apart, couples land between 8.77% and 9%.

How the odds are calculated →

By sign

Which signs make Mars square Sun

Sign pairs that make Mars square Sun (shaded)
Sign pairs that make Mars square Sun (shaded) Mars in Aries: Sun in Cancer or Capricorn; Mars in Taurus: Sun in Leo or Aquarius; Mars in Gemini: Sun in Virgo or Pisces; Mars in Cancer: Sun in Aries or Libra; Mars in Leo: Sun in Taurus or Scorpio; Mars in Virgo: Sun in Gemini or Sagittarius; Mars in Libra: Sun in Cancer or Capricorn; Mars in Scorpio: Sun in Leo or Aquarius; Mars in Sagittarius: Sun in Virgo or Pisces; Mars in Capricorn: Sun in Aries or Libra; Mars in Aquarius: Sun in Taurus or Scorpio; Mars in Pisces: Sun in Gemini or Sagittarius. Sun’s sign →Mars’ sign →AriTauGemCanLeoVirLibScoSagCapAquPisAriMars in Aries, Sun in AriesMars in Aries, Sun in TaurusMars in Aries, Sun in GeminiMars in Aries, Sun in Cancer — forms itMars in Aries, Sun in LeoMars in Aries, Sun in VirgoMars in Aries, Sun in LibraMars in Aries, Sun in ScorpioMars in Aries, Sun in SagittariusMars in Aries, Sun in Capricorn — forms itMars in Aries, Sun in AquariusMars in Aries, Sun in PiscesTauMars in Taurus, Sun in AriesMars in Taurus, Sun in TaurusMars in Taurus, Sun in GeminiMars in Taurus, Sun in CancerMars in Taurus, Sun in Leo — forms itMars in Taurus, Sun in VirgoMars in Taurus, Sun in LibraMars in Taurus, Sun in ScorpioMars in Taurus, Sun in SagittariusMars in Taurus, Sun in CapricornMars in Taurus, Sun in Aquarius — forms itMars in Taurus, Sun in PiscesGemMars in Gemini, Sun in AriesMars in Gemini, Sun in TaurusMars in Gemini, Sun in GeminiMars in Gemini, Sun in CancerMars in Gemini, Sun in LeoMars in Gemini, Sun in Virgo — forms itMars in Gemini, Sun in LibraMars in Gemini, Sun in ScorpioMars in Gemini, Sun in SagittariusMars in Gemini, Sun in CapricornMars in Gemini, Sun in AquariusMars in Gemini, Sun in Pisces — forms itCanMars in Cancer, Sun in Aries — forms itMars in Cancer, Sun in TaurusMars in Cancer, Sun in GeminiMars in Cancer, Sun in CancerMars in Cancer, Sun in LeoMars in Cancer, Sun in VirgoMars in Cancer, Sun in Libra — forms itMars in Cancer, Sun in ScorpioMars in Cancer, Sun in SagittariusMars in Cancer, Sun in CapricornMars in Cancer, Sun in AquariusMars in Cancer, Sun in PiscesLeoMars in Leo, Sun in AriesMars in Leo, Sun in Taurus — forms itMars in Leo, Sun in GeminiMars in Leo, Sun in CancerMars in Leo, Sun in LeoMars in Leo, Sun in VirgoMars in Leo, Sun in LibraMars in Leo, Sun in Scorpio — forms itMars in Leo, Sun in SagittariusMars in Leo, Sun in CapricornMars in Leo, Sun in AquariusMars in Leo, Sun in PiscesVirMars in Virgo, Sun in AriesMars in Virgo, Sun in TaurusMars in Virgo, Sun in Gemini — forms itMars in Virgo, Sun in CancerMars in Virgo, Sun in LeoMars in Virgo, Sun in VirgoMars in Virgo, Sun in LibraMars in Virgo, Sun in ScorpioMars in Virgo, Sun in Sagittarius — forms itMars in Virgo, Sun in CapricornMars in Virgo, Sun in AquariusMars in Virgo, Sun in PiscesLibMars in Libra, Sun in AriesMars in Libra, Sun in TaurusMars in Libra, Sun in GeminiMars in Libra, Sun in Cancer — forms itMars in Libra, Sun in LeoMars in Libra, Sun in VirgoMars in Libra, Sun in LibraMars in Libra, Sun in ScorpioMars in Libra, Sun in SagittariusMars in Libra, Sun in Capricorn — forms itMars in Libra, Sun in AquariusMars in Libra, Sun in PiscesScoMars in Scorpio, Sun in AriesMars in Scorpio, Sun in TaurusMars in Scorpio, Sun in GeminiMars in Scorpio, Sun in CancerMars in Scorpio, Sun in Leo — forms itMars in Scorpio, Sun in VirgoMars in Scorpio, Sun in LibraMars in Scorpio, Sun in ScorpioMars in Scorpio, Sun in SagittariusMars in Scorpio, Sun in CapricornMars in Scorpio, Sun in Aquarius — forms itMars in Scorpio, Sun in PiscesSagMars in Sagittarius, Sun in AriesMars in Sagittarius, Sun in TaurusMars in Sagittarius, Sun in GeminiMars in Sagittarius, Sun in CancerMars in Sagittarius, Sun in LeoMars in Sagittarius, Sun in Virgo — forms itMars in Sagittarius, Sun in LibraMars in Sagittarius, Sun in ScorpioMars in Sagittarius, Sun in SagittariusMars in Sagittarius, Sun in CapricornMars in Sagittarius, Sun in AquariusMars in Sagittarius, Sun in Pisces — forms itCapMars in Capricorn, Sun in Aries — forms itMars in Capricorn, Sun in TaurusMars in Capricorn, Sun in GeminiMars in Capricorn, Sun in CancerMars in Capricorn, Sun in LeoMars in Capricorn, Sun in VirgoMars in Capricorn, Sun in Libra — forms itMars in Capricorn, Sun in ScorpioMars in Capricorn, Sun in SagittariusMars in Capricorn, Sun in CapricornMars in Capricorn, Sun in AquariusMars in Capricorn, Sun in PiscesAquMars in Aquarius, Sun in AriesMars in Aquarius, Sun in Taurus — forms itMars in Aquarius, Sun in GeminiMars in Aquarius, Sun in CancerMars in Aquarius, Sun in LeoMars in Aquarius, Sun in VirgoMars in Aquarius, Sun in LibraMars in Aquarius, Sun in Scorpio — forms itMars in Aquarius, Sun in SagittariusMars in Aquarius, Sun in CapricornMars in Aquarius, Sun in AquariusMars in Aquarius, Sun in PiscesPisMars in Pisces, Sun in AriesMars in Pisces, Sun in TaurusMars in Pisces, Sun in Gemini — forms itMars in Pisces, Sun in CancerMars in Pisces, Sun in LeoMars in Pisces, Sun in VirgoMars in Pisces, Sun in LibraMars in Pisces, Sun in ScorpioMars in Pisces, Sun in Sagittarius — forms itMars in Pisces, Sun in CapricornMars in Pisces, Sun in AquariusMars in Pisces, Sun in PiscesSource: tropical zodiac, counted by signastrohot.com

To check it by degree: Mars at 10° Taurus makes the square with the Sun anywhere from 2° to 18° of Leo or Aquarius — the 90° angle give or take 8°. The grid goes by sign, but the square also forms across a sign line: Mars at 1° Taurus and the Sun at 29° Cancer are 88° apart, a sextile by sign.

Between two people

What does Mars square Sun mean in synastry?

Competition inside the relationship. Both people want to lead, and small decisions become tests of who gives way. The attraction is often strong for exactly the same reason, which is why it is easy to mistake rivalry for spark.

The usual mistake

Where does Mars square Sun usually go wrong?

Rivalry mistaken for spark. Small decisions become tests of who gives way, and the attraction keeps the contest going.

Over time

How Mars square Sun plays out over time

  1. Early on. Strong attraction with competition built in: both want to lead.
  2. Under pressure. Choices about dinner, vacations or furniture turn into contests of will.
  3. Years in. It works when leadership is divided by area of life.

Mars and Sun at other angles

At any angle: One person's identity and purpose meeting the other's drive. This pairing decides whether the two energize each other or compete for the same space.

The square among the Mars–Sun angles, % of couples
The square among the Mars–Sun angles, % of couples The square among the Mars–Sun angles, % of couples: Conjunction 0° 4.45%, Sextile 60° 6.69%, Square 90° 8.88%, Trine 120° 8.91%, Quincunx 150° 3.33%, Opposition 180° 4.44%. Conjunction 0°Conjunction 0°: 4.45%4.45%Sextile 60°Sextile 60°: 6.69%6.69%Square 90°Square 90°: 8.88%8.88%Trine 120°Trine 120°: 8.91%8.91%Quincunx 150°Quincunx 150°: 3.33%3.33%Opposition 180°Opposition 180°: 4.44%4.44%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com Conjunction 0°Conjunction 0°: 4.45%4.45%Sextile 60°Sextile 60°: 6.69%6.69%Square 90°Square 90°: 8.88%8.88%Trine 120°Trine 120°: 8.91%8.91%Quincunx 150°Quincunx 150°: 3.33%3.33%Opposition 180°Opposition 180°: 4.44%4.44%Source: AstroHot simulation, 3 million pairs, NASA JPL DE440astrohot.com
Opposition 180° · 4.44% of couples Sextile 60° · 6.69% of couples Trine 120° · 8.91% of couples Conjunction 0° · 4.45% of couples Quincunx 150° · 3.33% of couples

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

Pluto square Sun 90° · 8.9% of couples Moon opposition Venus 180° · 4.43% of couples Pluto trine Venus 120° · 8.83% of couples Moon opposition Saturn 180° · 4.44% of couples

Cite this page

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

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