Composite Chart Calculator
A composite chart is a powerful astrological tool used to understand the dynamics and purpose of a relationship. It's created by finding the mathematical midpoints between the planets and house cusps of two individual birth charts. This calculator will help you determine the composite positions of key astrological points for any two individuals.
The resulting composite chart represents the relationship itself as a separate entity, revealing its inherent strengths, challenges, and overall energetic blueprint. It's not about how two people interact individually, but rather what they create together as a unit.
Person 1 Birth Chart Data
Enter the zodiac sign and degree for each astrological point for Person 1.
AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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Person 2 Birth Chart Data
Enter the zodiac sign and degree for each astrological point for Person 2.
AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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AriesTaurusGeminiCancerLeoVirgoLibraScorpioSagittariusCapricornAquariusPisces
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Composite Chart Results
Enter the birth chart data for both individuals and click "Calculate Composite Chart" to see the results here.
Understanding Your Composite Chart
The composite chart is a unique astrological chart that represents the relationship itself. It's derived by taking the exact midpoints between corresponding planets and house cusps in two individual birth charts. For example, if Person A has their Sun at 10° Aries and Person B has their Sun at 20° Gemini, the composite Sun would be at the midpoint between these two points.
What Does a Composite Chart Reveal?
- Relationship Purpose: The composite Sun sign and house reveal the core identity and purpose of the relationship. What is this partnership here to achieve or express?
- Emotional Core: The composite Moon indicates the emotional tone, needs, and comfort zone of the relationship. How does the relationship feel from within?
- Communication Style: Composite Mercury shows how the couple communicates, thinks, and processes information together.
- Love & Values: Composite Venus describes the shared values, affections, and what brings joy and harmony to the relationship.
- Action & Drive: Composite Mars points to the relationship's energy, drive, how it asserts itself, and potential areas of conflict.
- Growth & Expansion: Composite Jupiter indicates areas of shared growth, optimism, and where the relationship finds luck or abundance.
- Structure & Challenges: Composite Saturn highlights the responsibilities, commitments, and potential limitations or lessons the relationship must learn.
- Innovation & Change: Composite Uranus shows where the relationship seeks freedom, innovation, or experiences sudden changes.
- Spirituality & Illusion: Composite Neptune reveals the spiritual ideals, dreams, and potential for illusion or confusion within the partnership.
- Transformation & Power: Composite Pluto indicates areas of deep transformation, power dynamics, and intense experiences within the relationship.
- Destiny & Path: The Composite North Node points to the evolutionary path and karmic direction of the relationship.
- Relationship Persona: The Composite Ascendant (and its ruling planet) describes how the relationship is perceived by the outside world and its overall demeanor.
Interpreting a composite chart involves looking at the signs, houses, and aspects formed between the composite planets. It offers profound insights into the nature of the bond, helping couples understand their shared journey and how they function as a single entity.
Calculated Composite Positions:
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var isValid = true;
// Helper function to get absolute degrees from sign and degree inputs
function getAbsDegrees(personPrefix, pointName) {
var signElement = document.getElementById(personPrefix + pointName + "Sign");
var degreeElement = document.getElementById(personPrefix + pointName + "Degree");
if (!signElement || !degreeElement) {
// This case should ideally not happen if all elements are correctly defined
isValid = false;
return NaN;
}
var signBaseDegrees = parseFloat(signElement.value);
var degreeInSign = parseFloat(degreeElement.value);
if (isNaN(signBaseDegrees) || isNaN(degreeInSign) || degreeInSign = 30) {
resultsHtml = "Please ensure all degree values are valid numbers between 0 and 29.99.";
isValid = false;
return NaN;
}
return (signBaseDegrees + degreeInSign);
}
// Helper function to convert absolute degrees back to sign and degree
function degreesToSignAndDegree(absDegrees) {
var signIndex = Math.floor(absDegrees / 30);
var degreeInSign = absDegrees % 30;
return {
sign: zodiacSigns[signIndex],
degree: degreeInSign.toFixed(2) // Format to 2 decimal places
};
}
// Helper function to calculate the shortest arc midpoint
function calculateMidpoint(deg1, deg2) {
var diff = deg2 – deg1;
if (diff > 180) {
diff -= 360;
}
if (diff < -180) {
diff += 360;
}
var midpoint = (deg1 + diff / 2 + 360) % 360;
return midpoint;
}
for (var i = 0; i < points.length; i++) {
var point = points[i];
var p1AbsDegrees = getAbsDegrees("p1", point);
var p2AbsDegrees = getAbsDegrees("p2", point);
if (!isValid) {
break; // Stop if any input is invalid
}
var compositeAbsDegrees = calculateMidpoint(p1AbsDegrees, p2AbsDegrees);
var compositePosition = degreesToSignAndDegree(compositeAbsDegrees);
resultsHtml += "
- Composite " + point + ": " + compositePosition.degree + "° " + compositePosition.sign + " "; } if (isValid) { resultsHtml += "