Understanding Synastry: A Guide to Relationship Astrology
Synastry is a branch of astrology that compares two birth charts to assess the dynamics and potential of a relationship. By examining the planetary placements and aspects between two individuals' charts, synastry can reveal areas of harmony, challenge, attraction, and growth. It's a powerful tool for understanding why certain relationships feel effortless while others require more work.
The Core Components of Synastry
While a full synastry reading involves many planetary interactions and house overlays, this calculator focuses on three fundamental components that offer significant insight into relationship compatibility:
Sun Sign: Represents the core identity, ego, life purpose, and conscious self. In synastry, Sun sign compatibility speaks to how two individuals' fundamental drives and personalities align.
Moon Sign: Governs emotions, instincts, inner needs, and subconscious reactions. Moon sign compatibility is crucial for emotional understanding, comfort, and how well partners can nurture each other.
Ascendant (Rising) Sign: Dictates how an individual presents themselves to the world, their initial impressions, physical appearance, and their approach to life. Ascendant compatibility can influence initial attraction and how partners interact on a daily basis.
How This Calculator Works
This Synastry Compatibility Calculator allows you to select the Sun, Moon, and Ascendant signs for two individuals. Based on the elemental and qualitative relationships between these signs, it provides an interpretive overview of their potential compatibility in key areas of their relationship. Remember, astrology offers insights and possibilities, not definitive predictions. A holistic view of a relationship always includes free will, communication, and mutual effort.
Synastry Compatibility Calculator
Person 1
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
Person 2
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
Select…
Aries
Taurus
Gemini
Cancer
Leo
Virgo
Libra
Scorpio
Sagittarius
Capricorn
Aquarius
Pisces
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#synastryResult {
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function getElement(sign) {
switch (sign) {
case 'Aries': case 'Leo': case 'Sagittarius': return 'Fire';
case 'Taurus': case 'Virgo': case 'Capricorn': return 'Earth';
case 'Gemini': case 'Libra': case 'Aquarius': return 'Air';
case 'Cancer': case 'Scorpio': case 'Pisces': return 'Water';
default: return ";
}
}
function getModality(sign) {
switch (sign) {
case 'Aries': case 'Cancer': case 'Libra': case 'Capricorn': return 'Cardinal';
case 'Taurus': case 'Leo': case 'Scorpio': case 'Aquarius': return 'Fixed';
case 'Gemini': case 'Virgo': case 'Sagittarius': case 'Pisces': return 'Mutable';
default: return ";
}
}
function getCompatibilityDescription(element1, element2, type) {
var description = "";
if (element1 === "" || element2 === "") {
return "";
}
if (element1 === element2) {
description += "There's a natural understanding and comfort between you. You share a similar fundamental approach to " + type + ", making it easy to connect and feel at home with each other. This can lead to deep empathy and shared experiences.";
} else if ((element1 === 'Fire' && element2 === 'Air') || (element1 === 'Air' && element2 === 'Fire')) {
description += "This combination brings excitement and intellectual stimulation. Fire inspires Air, and Air fuels Fire, creating a dynamic and engaging connection. You can motivate each other and enjoy lively discussions and shared adventures.";
} else if ((element1 === 'Earth' && element2 === 'Water') || (element1 === 'Water' && element2 === 'Earth')) {
description += "This pairing offers nurturing and stability. Earth provides a grounding presence for Water's emotions, while Water helps Earth signs to soften and flow. You can create a deeply supportive and emotionally rich environment together.";
} else if ((element1 === 'Fire' && element2 === 'Earth') || (element1 === 'Earth' && element2 === 'Fire')) {
description += "This can be a practical but sometimes challenging combination. Fire's drive might clash with Earth's need for stability, or Earth might feel stifled by Fire's impulsiveness. With effort, Fire can inspire Earth, and Earth can ground Fire, leading to productive outcomes.";
} else if ((element1 === 'Air' && element2 === 'Water') || (element1 === 'Water' && element2 === 'Air')) {
description += "This pairing can be intriguing but also prone to misunderstandings. Air seeks logic and detachment, while Water operates on emotion and intuition. Air might find Water too emotional, and Water might find Air too cold. Open communication is key to bridging this gap.";
} else if ((element1 === 'Fire' && element2 === 'Water') || (element1 === 'Water' && element2 === 'Fire')) {
description += "This is a highly dynamic and often intense combination. Fire can boil Water, and Water can extinguish Fire. There's strong attraction but also potential for emotional volatility and deep clashes. Understanding and respect for each other's fundamental nature are vital.";
} else if ((element1 === 'Earth' && element2 === 'Air') || (element1 === 'Air' && element2 === 'Earth')) {
description += "This combination can be intellectual and practical. Air brings ideas and communication, while Earth provides structure and manifestation. However, Air might find Earth too rigid, and Earth might find Air too scattered. Finding common ground in practical application can be beneficial.";
}
return description;
}
function getModalityDescription(modality1, modality2, type) {
var description = "";
if (modality1 === "" || modality2 === "") {
return "";
}
if (modality1 === modality2) {
description += "When your " + type + " signs share the same modality, there can be a strong sense of understanding in how you initiate, maintain, or adapt to situations. However, it can also lead to stubbornness or a lack of diverse approaches if not balanced. For example, two Cardinal signs might both want to lead, two Fixed signs might both resist change, and two Mutable signs might both struggle with commitment.";
} else if ((modality1 === 'Cardinal' && modality2 === 'Fixed') || (modality1 === 'Fixed' && modality2 === 'Cardinal')) {
description += "A Cardinal and Fixed " + type + " combination can be very productive. The Cardinal sign initiates, and the Fixed sign provides stability and follow-through. This can create a powerful team, but the Cardinal sign might find the Fixed sign too resistant to change, and the Fixed sign might find the Cardinal sign too impulsive.";
} else if ((modality1 === 'Cardinal' && modality2 === 'Mutable') || (modality1 === 'Mutable' && modality2 === 'Cardinal')) {
description += "The Cardinal and Mutable " + type + " pairing offers a dynamic interplay. Cardinal signs initiate, and Mutable signs adapt and refine. This can lead to flexible and evolving dynamics, but the Cardinal sign might find the Mutable sign indecisive, and the Mutable sign might find the Cardinal sign too pushy.";
} else if ((modality1 === 'Fixed' && modality2 === 'Mutable') || (modality1 === 'Mutable' && modality2 === 'Fixed')) {
description += "A Fixed and Mutable " + type + " combination can be about balancing stability with adaptability. Fixed signs provide consistency, while Mutable signs bring flexibility and new perspectives. The Fixed sign might see the Mutable sign as inconsistent, and the Mutable sign might see the Fixed sign as rigid. Learning to appreciate each other's strengths is key.";
}
return description;
}
function calculateSynastry() {
var p1SunSign = document.getElementById("p1SunSign").value;
var p1MoonSign = document.getElementById("p1MoonSign").value;
var p1AscendantSign = document.getElementById("p1AscendantSign").value;
var p2SunSign = document.getElementById("p2SunSign").value;
var p2MoonSign = document.getElementById("p2MoonSign").value;
var p2AscendantSign = document.getElementById("p2AscendantSign").value;
var resultDiv = document.getElementById("synastryResult");
resultDiv.innerHTML = ""; // Clear previous results
if (!p1SunSign || !p1MoonSign || !p1AscendantSign || !p2SunSign || !p2MoonSign || !p2AscendantSign) {
resultDiv.innerHTML = "Please select all signs for both individuals to calculate compatibility.";
return;
}
var p1SunElement = getElement(p1SunSign);
var p1MoonElement = getElement(p1MoonSign);
var p1AscendantElement = getElement(p1AscendantSign);
var p2SunElement = getElement(p2SunSign);
var p2MoonElement = getElement(p2MoonSign);
var p2AscendantElement = getElement(p2AscendantSign);
var p1SunModality = getModality(p1SunSign);
var p1MoonModality = getModality(p1MoonSign);
var p1AscendantModality = getModality(p1AscendantSign);
var p2SunModality = getModality(p2SunSign);
var p2MoonModality = getModality(p2MoonSign);
var p2AscendantModality = getModality(p2AscendantSign);
var output = "
";
output += "" + getCompatibilityDescription(p1AscendantElement, p2AscendantElement, "initial impression and daily interactions") + "";
output += "" + getModalityDescription(p1AscendantModality, p2AscendantModality, "Ascendant") + "";
// Cross-Aspects (Simplified: P1 Sun vs P2 Moon, P2 Sun vs P1 Moon)
output += "
Cross-Aspects: Person 1's Sun & Person 2's Moon (" + p1SunSign + " & " + p2MoonSign + ")
";
output += "This connection speaks to how Person 1's core identity resonates with Person 2's emotional nature. " + getCompatibilityDescription(p1SunElement, p2MoonElement, "how Person 1's core identity aligns with Person 2's emotional needs") + "";
output += "
Cross-Aspects: Person 2's Sun & Person 1's Moon (" + p2SunSign + " & " + p1MoonSign + ")
";
output += "This connection speaks to how Person 2's core identity resonates with Person 1's emotional nature. " + getCompatibilityDescription(p2SunElement, p1MoonElement, "how Person 2's core identity aligns with Person 1's emotional needs") + "";
output += "Disclaimer: This calculator provides simplified astrological interpretations based on sign elements and modalities. For a comprehensive synastry analysis, consult a professional astrologer who can analyze full birth charts, planetary aspects, and house overlays.";
resultDiv.innerHTML = output;
}