Birth Chart Compatibility Calculator
Explore the astrological compatibility between two individuals based on their Sun, Moon, and Ascendant signs. This calculator provides a fun, simplified insight into potential dynamics, offering a glimpse into how different energies might blend.
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function getSignElement(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 getSignModality(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 calculateCompatibility() {
var p1Sun = document.getElementById('p1SunSign').value;
var p1Moon = document.getElementById('p1MoonSign').value;
var p1Ascendant = document.getElementById('p1Ascendant').value;
var p2Sun = document.getElementById('p2SunSign').value;
var p2Moon = document.getElementById('p2MoonSign').value;
var p2Ascendant = document.getElementById('p2Ascendant').value;
if (!p1Sun || !p1Moon || !p1Ascendant || !p2Sun || !p2Moon || !p2Ascendant) {
document.getElementById('compatibilityResult').innerHTML = 'Please select all signs for both individuals.';
return;
}
var compatibilityScore = 0;
var maxScore = 100; // Arbitrary max score for scaling
// — Sun Sign Compatibility (Core Personality) —
var p1SunElement = getSignElement(p1Sun);
var p2SunElement = getSignElement(p2Sun);
if (p1SunElement === p2SunElement) {
compatibilityScore += 20; // Same element (e.g., Fire-Fire)
} else if ((p1SunElement === 'Fire' && p2SunElement === 'Air') || (p1SunElement === 'Air' && p2SunElement === 'Fire') ||
(p1SunElement === 'Earth' && p2SunElement === 'Water') || (p1SunElement === 'Water' && p2SunElement === 'Earth')) {
compatibilityScore += 15; // Complementary elements
} else if (p1Sun === p2Sun) {
compatibilityScore += 10; // Same sign
} else if (p1SunElement !== p2SunElement) {
compatibilityScore += 5; // Different elements, but not opposing
}
// — Moon Sign Compatibility (Emotional Connection) —
var p1MoonElement = getSignElement(p1Moon);
var p2MoonElement = getSignElement(p2Moon);
if (p1MoonElement === p2MoonElement) {
compatibilityScore += 25; // Strong emotional resonance
} else if ((p1MoonElement === 'Fire' && p2MoonElement === 'Air') || (p1MoonElement === 'Air' && p2MoonElement === 'Fire') ||
(p1MoonElement === 'Earth' && p2MoonElement === 'Water') || (p1MoonElement === 'Water' && p2MoonElement === 'Earth')) {
compatibilityScore += 18; // Good emotional understanding
} else if (p1Moon === p2Moon) {
compatibilityScore += 12; // Deep emotional connection
} else if (p1MoonElement !== p2MoonElement) {
compatibilityScore += 7; // Different emotional needs, but manageable
}
// — Ascendant Compatibility (First Impressions, Life Approach) —
var p1AscendantElement = getSignElement(p1Ascendant);
var p2AscendantElement = getSignElement(p2Ascendant);
if (p1AscendantElement === p2AscendantElement) {
compatibilityScore += 15; // Similar approach to life
} else if ((p1AscendantElement === 'Fire' && p2AscendantElement === 'Air') || (p1AscendantElement === 'Air' && p2AscendantElement === 'Fire') ||
(p1AscendantElement === 'Earth' && p2AscendantElement === 'Water') || (p1AscendantElement === 'Water' && p2AscendantElement === 'Earth')) {
compatibilityScore += 10; // Complementary life approaches
} else if (p1Ascendant === p2Ascendant) {
compatibilityScore += 8; // Very similar outward expression
} else if (p1AscendantElement !== p2AscendantElement) {
compatibilityScore += 3; // Different outward styles
}
// — Modality Compatibility (How they initiate, sustain, and adapt) —
var p1SunModality = getSignModality(p1Sun);
var p2SunModality = getSignModality(p2Sun);
if (p1SunModality === p2SunModality) {
compatibilityScore += 5; // Similar way of operating
} else if ((p1SunModality === 'Cardinal' && p2SunModality === 'Fixed') || (p1SunModality === 'Fixed' && p2SunModality === 'Cardinal')) {
compatibilityScore += 3; // Can balance each other
}
var p1MoonModality = getSignModality(p1Moon);
var p2MoonModality = getSignModality(p2Moon);
if (p1MoonModality === p2MoonModality) {
compatibilityScore += 5; // Similar emotional rhythm
}
// Normalize score to a 0-100 scale (approximate, as maxScore is arbitrary)
var finalScore = Math.min(100, Math.round(compatibilityScore * (100 / 90))); // Max possible score with current points is around 90
var interpretation = ";
if (finalScore >= 80) {
interpretation = 'Excellent Compatibility: A strong and harmonious connection, indicating natural understanding and flow between you.';
} else if (finalScore >= 60) {
interpretation = 'Good Compatibility: A solid foundation with many areas of natural resonance. Potential for a deep and fulfilling relationship.';
} else if (finalScore >= 40) {
interpretation = 'Moderate Compatibility: You have some common ground but also areas that require effort and understanding. Growth is possible through communication.';
} else {
interpretation = 'Challenging Compatibility: Significant differences may exist, requiring conscious effort, patience, and compromise to build a strong connection.';
}
var resultHTML = '
Compatibility Analysis
';
resultHTML += 'Your overall compatibility score is:
' + finalScore + '%';
resultHTML += " + interpretation + ";
resultHTML += '
This is a simplified astrological compatibility reading for entertainment purposes. For a deeper analysis, consult a professional astrologer.';
document.getElementById('compatibilityResult').innerHTML = resultHTML;
}
Understanding Birth Chart Compatibility (Synastry)
Birth chart compatibility, often referred to as synastry in astrology, is the study of how two individual birth charts interact with each other. It helps to understand the dynamics, strengths, and challenges within a relationship. While a full synastry reading involves analyzing all planets, houses, and aspects, three key components offer significant insights:
1. Sun Sign Compatibility
Your Sun sign represents your core identity, ego, and fundamental life purpose. When comparing Sun signs, astrologers look at how two individuals' basic personalities and life drives align. Similar elements (e.g., Fire with Fire, Earth with Earth) often indicate a natural understanding and shared outlook. Complementary elements (e.g., Fire with Air, Earth with Water) can create a dynamic balance, while opposing elements might present challenges but also opportunities for growth.
- Fire Signs (Aries, Leo, Sagittarius): Passionate, energetic, enthusiastic.
- Earth Signs (Taurus, Virgo, Capricorn): Practical, grounded, stable.
- Air Signs (Gemini, Libra, Aquarius): Intellectual, communicative, social.
- Water Signs (Cancer, Scorpio, Pisces): Emotional, intuitive, nurturing.
2. Moon Sign Compatibility
The Moon sign governs your emotional nature, instincts, subconscious reactions, and what makes you feel safe and nurtured. Moon sign compatibility is crucial for emotional harmony in a relationship. When Moon signs are compatible, individuals tend to understand each other's emotional needs and responses intuitively, leading to a feeling of deep comfort and security. Differences here can lead to misunderstandings or a feeling of not being truly "seen" emotionally.
3. Ascendant (Rising Sign) Compatibility
Your Ascendant, or Rising Sign, represents your outer personality, how you present yourself to the world, your initial reactions, and your physical appearance. It's the "mask" you wear. Ascendant compatibility influences first impressions and how two people interact on a day-to-day basis. Similar or complementary Ascendants can mean you appreciate each other's style and approach to life, making daily interactions smoother.
How This Calculator Works (Simplified)
This calculator takes your selected Sun, Moon, and Ascendant signs and assigns compatibility points based on elemental and modality relationships. For instance, two Fire signs will get points for Sun compatibility, as will a Fire and an Air sign. The total points are then scaled to a percentage, offering a general compatibility score and a brief interpretation. It's important to remember that this is a highly simplified model and does not replace a comprehensive astrological reading, which considers many more planetary placements and aspects.
Examples of Compatibility Readings:
Let's consider a few hypothetical scenarios:
- Example 1: High Compatibility
Person 1: Sun in Leo (Fire), Moon in Aries (Fire), Ascendant in Sagittarius (Fire)
Person 2: Sun in Sagittarius (Fire), Moon in Leo (Fire), Ascendant in Aries (Fire)
Result: This combination would likely yield a very high compatibility score. All core placements are in Fire signs, indicating a shared passion, enthusiasm, and zest for life. They would likely understand each other's drive and emotional needs instinctively, leading to a dynamic and exciting relationship.
- Example 2: Moderate Compatibility
Person 1: Sun in Taurus (Earth), Moon in Cancer (Water), Ascendant in Libra (Air)
Person 2: Sun in Virgo (Earth), Moon in Scorpio (Water), Ascendant in Gemini (Air)
Result: This pairing would likely show moderate to good compatibility. Both have Earth Sun signs, suggesting a practical and grounded approach to life. Their Water Moon signs indicate deep emotional understanding, though Scorpio Moon is more intense than Cancer Moon. The Air Ascendants suggest good communication and social interaction. The different modalities (Taurus Fixed, Virgo Mutable) might require some adjustment in how they approach change.
- Example 3: Challenging Compatibility
Person 1: Sun in Aries (Fire), Moon in Capricorn (Earth), Ascendant in Cancer (Water)
Person 2: Sun in Libra (Air), Moon in Gemini (Air), Ascendant in Scorpio (Water)
Result: This combination might present more challenges. Aries Sun is direct and impulsive, while Libra Sun seeks balance and harmony. Capricorn Moon is reserved and practical emotionally, contrasting with Gemini Moon's need for intellectual stimulation and variety. While both have Water Ascendants, Cancer is nurturing and home-oriented, while Scorpio is intense and private. This relationship would require significant effort to bridge these fundamental differences in core identity, emotional expression, and outward demeanor.
Remember, astrology offers insights, but free will and conscious effort are always key to any successful relationship.