Synastry Aspect Calculator
Enter the Sun and Moon sign and degree for two individuals to calculate key synastry aspects. This calculator focuses on the angular relationships between the Sun and Moon placements in each chart, offering insights into fundamental compatibility and dynamics.
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.person-inputs select,
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function convertToAbsoluteDegree(sign, degree) {
var signDegrees = {
"Aries": 0, "Taurus": 30, "Gemini": 60, "Cancer": 90, "Leo": 120, "Virgo": 150,
"Libra": 180, "Scorpio": 210, "Sagittarius": 240, "Capricorn": 270, "Aquarius": 300, "Pisces": 330
};
return signDegrees[sign] + parseInt(degree);
}
function identifyAspect(normalizedAngleDiff) {
var aspects = [
{ name: "Conjunction", angle: 0, orb: 8 },
{ name: "Sextile", angle: 60, orb: 6 },
{ name: "Square", angle: 90, orb: 8 },
{ name: "Trine", angle: 120, orb: 8 },
{ name: "Opposition", angle: 180, orb: 8 }
];
for (var i = 0; i = lowerBound && normalizedAngleDiff <= upperBound) {
return aspect.name;
}
}
return "No Major Aspect";
}
function getAspectInterpretation(aspectName, planet1, planet2) {
var interpretations = {
"Conjunction": {
"Sun-Sun": "A powerful merging of core identities and life purpose. You likely share fundamental goals and a similar approach to life, leading to strong mutual understanding and support.",
"Sun-Moon": "A deep, intuitive understanding and emotional resonance. The Sun person's conscious will aligns with the Moon person's emotional needs, fostering comfort and harmony.",
"Moon-Sun": "Similar to Sun-Moon, but with the Moon person's emotions aligning with the Sun person's core identity. This often indicates a natural emotional rapport and a feeling of being 'seen' and understood.",
"Moon-Moon": "Profound emotional connection and empathy. You instinctively understand each other's feelings and needs, creating a sense of emotional security and belonging."
},
"Sextile": {
"Sun-Sun": "An easy flow of energy between your core identities. You find it simple to support each other's goals and express yourselves freely, leading to harmonious interaction.",
"Sun-Moon": "A natural ease in emotional expression and understanding. The Sun person's will and the Moon person's emotions complement each other, making communication smooth and supportive.",
"Moon-Sun": "Similar to Sun-Moon, indicating an easy and supportive emotional dynamic. The Moon person feels comfortable expressing their feelings, and the Sun person readily understands and supports them.",
"Moon-Moon": "A comfortable and supportive emotional bond. You find it easy to share feelings and offer comfort, creating a gentle and nurturing connection."
},
"Square": {
"Sun-Sun": "A dynamic tension between your core identities. While challenging, this aspect can stimulate growth and push you to overcome obstacles together, though it may require effort to resolve differences.",
"Sun-Moon": "A challenging dynamic where the Sun person's will may clash with the Moon person's emotional needs, or vice versa. This can lead to friction but also provides opportunities for growth and deeper understanding if navigated consciously.",
"Moon-Sun": "Similar to Sun-Moon, indicating potential friction between emotional needs and conscious will. This aspect can bring out insecurities but also encourages both individuals to develop greater emotional maturity.",
"Moon-Moon": "Emotional friction and misunderstandings. You may struggle to align your emotional needs, leading to arguments or feelings of being misunderstood. However, it can also lead to profound emotional growth if addressed openly."
},
"Trine": {
"Sun-Sun": "A harmonious and effortless connection between your core identities. You naturally support each other's life paths and feel a deep sense of ease and understanding.",
"Sun-Moon": "A highly harmonious and supportive aspect. The Sun person's conscious will and the Moon person's emotional nature blend seamlessly, creating a feeling of natural comfort and mutual appreciation.",
"Moon-Sun": "Similar to Sun-Moon, indicating a natural and easy flow between emotional needs and conscious expression. The Moon person feels safe to express, and the Sun person provides stable support.",
"Moon-Moon": "A deeply harmonious and comforting emotional bond. You share similar emotional responses and needs, leading to a feeling of profound understanding, security, and mutual support."
},
"Opposition": {
"Sun-Sun": "A dynamic of attraction and polarity between your core identities. You may represent qualities the other lacks, leading to a sense of completion but also potential for projection and conflict if not balanced.",
"Sun-Moon": "A strong attraction based on complementary differences. The Sun person's conscious identity and the Moon person's emotional nature are opposite yet can complete each other, though it requires conscious effort to integrate these differences.",
"Moon-Sun": "Similar to Sun-Moon, highlighting a dynamic of attraction and potential for growth through integrating differences. The Moon person's emotional world contrasts with the Sun person's identity, offering opportunities for balance.",
"Moon-Moon": "A strong emotional pull, but also potential for emotional misunderstanding or feeling emotionally 'opposite'. You may have different ways of processing feelings, requiring conscious effort to bridge the gap and find common ground."
}
};
return interpretations[aspectName] ? interpretations[aspectName][planet1 + "-" + planet2] : "";
}
function calculateSynastry() {
var personASunSign = document.getElementById("personASunSign").value;
var personASunDegree = parseInt(document.getElementById("personASunDegree").value);
var personAMoonSign = document.getElementById("personAMoonSign").value;
var personAMoonDegree = parseInt(document.getElementById("personAMoonDegree").value);
var personBSunSign = document.getElementById("personBSunSign").value;
var personBSunDegree = parseInt(document.getElementById("personBSunDegree").value);
var personBMoonSign = document.getElementById("personBMoonSign").value;
var personBMoonDegree = parseInt(document.getElementById("personBMoonDegree").value);
var resultDiv = document.getElementById("synastryResult");
resultDiv.innerHTML = ""; // Clear previous results
// Input validation
if (isNaN(personASunDegree) || personASunDegree 29 ||
isNaN(personAMoonDegree) || personAMoonDegree 29 ||
isNaN(personBSunDegree) || personBSunDegree 29 ||
isNaN(personBMoonDegree) || personBMoonDegree 29) {
resultDiv.innerHTML = "Please enter valid degrees between 0 and 29 for all placements.";
return;
}
var absDegASun = convertToAbsoluteDegree(personASunSign, personASunDegree);
var absDegAMoon = convertToAbsoluteDegree(personAMoonSign, personAMoonDegree);
var absDegBSun = convertToAbsoluteDegree(personBSunSign, personBSunDegree);
var absDegBMoon = convertToAbsoluteDegree(personBMoonSign, personBMoonDegree);
var aspectsFound = [];
// Function to calculate and store aspect
function processAspect(p1Name, p1AbsDeg, p2Name, p2AbsDeg) {
var diff = Math.abs(p1AbsDeg – p2AbsDeg);
var normalizedDiff = Math.min(diff, 360 – diff);
var aspect = identifyAspect(normalizedDiff);
if (aspect !== "No Major Aspect") {
aspectsFound.push({
planets: p1Name + " – " + p2Name,
aspect: aspect,
degreeDiff: normalizedDiff
});
}
}
processAspect("Person A's Sun", absDegASun, "Person B's Sun", absDegBSun);
processAspect("Person A's Sun", absDegASun, "Person B's Moon", absDegBMoon);
processAspect("Person A's Moon", absDegAMoon, "Person B's Sun", absDegBSun);
processAspect("Person A's Moon", absDegAMoon, "Person B's Moon", absDegBMoon);
if (aspectsFound.length === 0) {
resultDiv.innerHTML = "
Synastry Aspects
No major aspects found between the Sun and Moon placements with the given orbs. This doesn't mean there's no compatibility, just that these specific planetary pairs aren't forming a strong angular relationship.";
} else {
var outputHtml = "
Synastry Aspects
";
for (var i = 0; i < aspectsFound.length; i++) {
var aspectData = aspectsFound[i];
var planetPair = aspectData.planets.split(" – ");
var p1 = planetPair[0].includes("Sun") ? "Sun" : "Moon";
var p2 = planetPair[1].includes("Sun") ? "Sun" : "Moon";
var interpretationKey = p1 + "-" + p2;
outputHtml += "
" + aspectData.planets + " " + aspectData.aspect + " (Orb: " + aspectData.degreeDiff.toFixed(1) + " degrees)";
outputHtml += "" + getAspectInterpretation(aspectData.aspect, p1, p2) + "";
}
resultDiv.innerHTML = outputHtml;
}
}
Understanding Synastry: A Guide to Relationship Astrology
Synastry is a branch of astrology that compares two natal charts to assess the dynamics and potential of a relationship. It's not about predicting fate, but rather understanding the energetic interplay between two individuals, highlighting areas of harmony, challenge, attraction, and growth.
What is a Natal Chart?
Before diving into synastry, it's crucial to understand the natal chart. A natal chart is a snapshot of the sky at the exact moment and location of your birth. It reveals the positions of the Sun, Moon, planets, and other astrological points in specific zodiac signs and houses. Each planet represents a different facet of your personality and life experience:
- Sun: Your core identity, ego, life purpose, and conscious will.
- Moon: Your emotional nature, instincts, subconscious reactions, and need for security.
- Mercury: Communication style, intellect, and thought processes.
- Venus: Love, relationships, values, and what you find pleasurable.
- Mars: Drive, ambition, passion, and how you assert yourself.
- Jupiter: Growth, expansion, luck, and beliefs.
- Saturn: Discipline, responsibility, challenges, and lessons.
- Outer Planets (Uranus, Neptune, Pluto): Generational influences, collective unconscious, and deeper transformations.
The Essence of Synastry: Comparing Charts
When two natal charts are compared, astrologers look for "aspects" – the angular relationships between the planets and points in one person's chart to those in the other person's chart. These aspects reveal how different parts of your personalities interact. For example, how does Person A's Sun (their core identity) interact with Person B's Moon (their emotional nature)?
Key Synastry Aspects and Their Meanings
The calculator above focuses on the major aspects between the Sun and Moon, which are fundamental to understanding relationship dynamics. Here's a brief overview of what these aspects signify:
- Conjunction (0 degrees): A powerful merging of energies. When two planets are conjunct, their energies blend, creating a strong sense of shared purpose or intense connection in that area of life. It can feel like a natural understanding or a strong pull.
- Sextile (60 degrees): An easy flow and opportunity. Sextiles indicate areas where individuals can easily support each other, offering natural harmony and opportunities for growth and positive interaction.
- Square (90 degrees): Dynamic tension and challenge. Squares highlight areas of friction, conflict, or misunderstanding. While challenging, they are also powerful catalysts for growth, pushing individuals to confront issues and evolve.
- Trine (120 degrees): Effortless harmony and support. Trines represent areas where energies flow smoothly and naturally. They bring ease, comfort, and mutual support, often feeling like a natural fit.
- Opposition (180 degrees): Polarity, attraction, and balance. Oppositions indicate a strong pull between complementary energies. They can bring a sense of completion but also highlight differences that need to be balanced and integrated.
The Sun and Moon in Synastry
The Sun and Moon are considered the "luminaries" and are paramount in synastry:
- Sun-Sun Aspects: Reveal how your core identities and life purposes align or challenge each other. Harmonious aspects suggest shared goals and mutual respect, while challenging ones can indicate power struggles or differing life directions.
- Sun-Moon Aspects: These are often considered the most important for romantic compatibility. They show how one person's conscious will (Sun) interacts with the other's emotional needs (Moon). Harmonious Sun-Moon aspects indicate deep understanding, emotional comfort, and a feeling of being "seen." Challenging aspects can lead to emotional friction or a struggle to meet each other's needs.
- Moon-Moon Aspects: Highlight the emotional rapport and instinctive understanding between two people. Harmonious Moon-Moon aspects suggest similar emotional responses and a deep sense of empathy, while challenging ones can lead to emotional misunderstandings or differing ways of seeking comfort.
How to Use This Calculator
To use this Synastry Aspect Calculator, you will need the exact sign and degree of the Sun and Moon for both individuals. You can typically find this information by generating a free natal chart online using your birth date, time, and location. Once you have these details, input them into the respective fields and click "Calculate Synastry Aspects" to see the major aspects formed between these key planetary placements and their interpretations.
Important Considerations
This calculator provides a simplified view by focusing on Sun and Moon aspects. A full synastry analysis would involve examining all planetary inter-aspects, house overlays, and composite charts. However, the Sun and Moon provide a powerful foundation for understanding the core dynamics of any relationship.
Remember, astrology is a tool for self-understanding and insight, not a definitive predictor. Relationships are complex and require conscious effort, communication, and mutual respect, regardless of astrological aspects.
Example Calculation:
Let's consider an example:
- Person A: Sun in Aries 15°, Moon in Cancer 20°
- Person B: Sun in Libra 10°, Moon in Capricorn 25°
Using the calculator with these inputs would yield results like:
- Person A's Sun – Person B's Sun Opposition: Person A's assertive, pioneering nature (Aries Sun) meets Person B's desire for balance and partnership (Libra Sun). This creates a dynamic pull, where each person may see in the other qualities they lack, leading to strong attraction but also potential for projection or needing to find common ground.
- Person A's Sun – Person B's Moon Square: Person A's direct, fiery identity (Aries Sun) may clash with Person B's reserved, practical emotional needs (Capricorn Moon). This could lead to friction where Person A feels Person B is too cautious, and Person B feels Person A is too impulsive, requiring conscious effort to understand each other's fundamental approaches.
- Person A's Moon – Person B's Sun Square: Person A's nurturing, sensitive emotional nature (Cancer Moon) may feel challenged by Person B's focus on fairness and intellectual connection (Libra Sun). Person A might feel emotionally unsupported, while Person B might find Person A's emotionality overwhelming, necessitating open communication to bridge the gap.
- Person A's Moon – Person B's Moon Opposition: Person A's need for emotional security and nurturing (Cancer Moon) contrasts with Person B's need for structure and achievement in emotional expression (Capricorn Moon). This can create a dynamic where they seek different things emotionally, but also have the potential to balance each other out if they learn to appreciate their complementary emotional styles.
This example demonstrates how the calculator can illuminate specific areas of connection and challenge within a relationship.