Astrology Chart Calculator: Understand Your Natal Chart
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Your Natal Chart Snapshot
Key Assumptions:
Date:
Time:
Location:
Formula Explanation: This calculator uses astronomical algorithms to determine the precise positions of celestial bodies (Sun, Moon, planets) and sensitive points (Ascendant, MC) in the zodiac at the exact moment and location of your birth. The Ascendant and MC are calculated based on your birth time, latitude, and longitude, while planetary positions are determined by your birth date and time.
Planetary Positions Table
Planetary Positions
| Planet |
Sign |
Degree |
House |
Zodiac Sign Distribution Chart
Astrology Chart Calculator: Unlocking Your Cosmic Blueprint
{primary_keyword} is a powerful tool that provides a unique snapshot of the cosmos at the precise moment of your birth. This celestial map, often referred to as a natal chart or birth chart, is believed by astrologers to reveal profound insights into your personality, potential, life path, relationships, and more. Understanding your astrology chart calculator can be a journey of self-discovery, offering clarity on your strengths, challenges, and the underlying energies that shape your life experiences.
What is an Astrology Chart Calculator?
An astrology chart calculator is a digital tool that generates a personalized astrological chart based on your birth date, time, and location. Unlike generic horoscopes that apply to broad sun signs, a natal chart is highly individualized. It maps the positions of the Sun, Moon, planets, and sensitive points like the Ascendant (Rising Sign) and Midheaven (MC) within the twelve zodiac signs and twelve astrological houses at the exact moment you were born.
Who should use it? Anyone curious about self-understanding, personal growth, understanding relationships, or exploring the symbolic language of the stars can benefit from using an astrology chart calculator. It's a valuable resource for:
- Individuals seeking deeper self-awareness.
- Those interested in understanding their innate talents and challenges.
- People looking to gain perspective on life patterns and cycles.
- Anyone curious about the astrological influences on their life.
Common misconceptions: A frequent misunderstanding is that astrology is purely deterministic, suggesting fate is fixed. In reality, most modern astrologers view the natal chart as a map of potentials and tendencies, not a rigid destiny. Your free will and choices play a crucial role in how these energies manifest. Another misconception is that all astrology is the same; a natal chart is vastly different from a daily horoscope, which is based solely on the Sun sign.
Astrology Chart Calculator Formula and Mathematical Explanation
The calculation of an astrology chart is a complex process rooted in ephemerides (tables of celestial bodies' positions) and spherical trigonometry. While a full, precise calculation involves sophisticated astronomical algorithms and precise time/location data, the core principles involve determining:
- Sidereal Time: This is the time relative to the stars, crucial for calculating the Ascendant and MC. It depends on the Universal Time (UT) and the observer's longitude.
- House System: Different house systems (e.g., Placidus, Koch, Whole Sign) divide the sky into twelve houses. The Placidus system is common and is used here. The cusps (beginnings) of these houses are calculated based on the sidereal time, latitude, and the chosen house system.
- Planetary Positions: The positions of the Sun, Moon, and planets are determined using astronomical data (ephemerides) for the specific date and time. These positions are usually given in ecliptic longitude (degrees within the zodiac).
- Ascendant (Rising Sign): This is the zodiac sign that was rising on the eastern horizon at the moment of birth. It's calculated using the sidereal time and latitude.
- Midheaven (MC): This is the highest point in the sky at the moment of birth, representing the 10th house cusp. It's calculated using sidereal time and latitude.
Variable Explanations:
Astrology Chart Variables
| Variable |
Meaning |
Unit |
Typical Range |
| Birth Date |
The calendar date of birth. |
Date |
N/A |
| Birth Time |
The precise time of birth. |
Time (HH:MM:SS) |
N/A |
| Birth Location |
Geographical coordinates of birth. |
City, State, Country |
N/A |
| Latitude |
North-South position on Earth. |
Decimal Degrees |
-90 to +90 |
| Longitude |
East-West position on Earth. |
Decimal Degrees |
-180 to +180 |
| Timezone Offset |
Difference from Coordinated Universal Time (UTC). |
Hours |
-12 to +14 |
| Sidereal Time |
Time relative to the stars. |
Hours, Minutes, Seconds |
0 to 24 |
| Zodiac Sign |
One of the 12 divisions of the ecliptic. |
Sign Name (Aries, Taurus, etc.) |
N/A |
| Degree |
Position within a zodiac sign. |
0° to 29°59′ |
N/A |
| House Number |
One of the 12 divisions of the sky. |
1 to 12 |
N/A |
Practical Examples (Real-World Use Cases)
Let's explore how an astrology chart calculator can provide insights:
Example 1: The Ambitious Entrepreneur
Inputs:
- Date: 1990-05-15
- Time: 09:10
- Location: San Francisco, CA, USA
- Latitude: 37.7749
- Longitude: -122.4194
- Timezone: UTC-7 (during Daylight Saving Time)
Calculated Results (Illustrative):
- Primary Result: Sun in Taurus, Ascendant in Leo, MC in Taurus.
- Intermediate Values: Sun at 24° Taurus, Ascendant at 18° Leo, MC at 15° Taurus.
- Planetary Positions: Mercury in Gemini, Venus in Aries, Mars in Cancer, etc.
Interpretation: This individual likely possesses a strong drive for success and stability (Sun and MC in Taurus), combined with a natural leadership presence and charisma (Ascendant in Leo). Their ambition is grounded, practical, and focused on building lasting achievements. They might be drawn to careers involving tangible results, finance, or creative ventures where they can shine.
Example 2: The Compassionate Healer
Inputs:
- Date: 1985-09-20
- Time: 23:45
- Location: Sydney, NSW, Australia
- Latitude: -33.8688
- Longitude: 151.2093
- Timezone: UTC+10 (during Daylight Saving Time)
Calculated Results (Illustrative):
- Primary Result: Sun in Virgo, Ascendant in Pisces, MC in Virgo.
- Intermediate Values: Sun at 27° Virgo, Ascendant at 12° Pisces, MC at 25° Virgo.
- Planetary Positions: Moon in Cancer, Venus in Libra, Mars in Scorpio, etc.
Interpretation: This chart suggests a person with a deeply empathetic and intuitive nature (Ascendant in Pisces), combined with a practical, analytical, and service-oriented approach to life (Sun and MC in Virgo). They are likely drawn to helping professions, healing arts, or roles where they can use their analytical skills to serve others. Their compassion is balanced by a need for order and efficiency.
How to Use This Astrology Chart Calculator
Using our astrology chart calculator is straightforward:
- Enter Birth Details: Accurately input your full date of birth, exact time of birth (as precise as possible), and the city, state/province, and country of your birth.
- Provide Location Coordinates: If you know your birth latitude and longitude, enter them. If not, the calculator will attempt to find them based on your location name, but precise coordinates yield the most accurate results.
- Select Timezone: Choose the correct timezone offset from UTC for your birth location. This is crucial for accurate Ascendant and MC calculations.
- Calculate: Click the "Calculate Chart" button.
- Interpret Results: The calculator will display your primary astrological placements (Sun, Moon, Ascendant, MC), a table of planetary positions in signs and houses, and a visual chart.
How to read results:
- Primary Result: Highlights your Sun sign (core identity), Ascendant (how you appear to others and initiate things), and Midheaven (career and public image).
- Planetary Positions Table: Shows each planet's sign, degree within that sign, and the house it falls into. Each planet, sign, and house combination offers unique insights.
- Zodiac Sign Distribution Chart: Visually represents where the planets are clustered, indicating dominant energies.
Decision-making guidance: Use the insights from your astrology chart calculator to understand your natural inclinations. For example, if your chart shows strong placements related to communication, you might consider a career in writing or public speaking. If you see challenges in relationships, understanding the astrological factors can help you navigate them more consciously.
Key Factors That Affect Astrology Chart Results
The accuracy and interpretation of your astrology chart calculator are influenced by several critical factors:
- Accuracy of Birth Time: This is arguably the most critical factor. Even a few minutes' difference can shift the Ascendant and house cusps significantly, altering the chart's interpretation, especially concerning houses and the Ascendant/MC.
- Precision of Birth Location: Latitude and longitude pinpoint your exact position on Earth, which is essential for calculating the Ascendant and house system accurately. Small errors in coordinates can lead to noticeable differences.
- Timezone and Daylight Saving Time (DST): Incorrectly applying the timezone or failing to account for DST at the time of birth will lead to inaccurate calculations of Universal Time, consequently affecting the Ascendant and planetary positions.
- Choice of House System: Different astrologers use various house systems (Placidus, Koch, Whole Sign, etc.). While planetary positions remain the same, the house placements can differ, influencing interpretations related to life areas. Our calculator defaults to the widely used Placidus system.
- Ephemeris Accuracy: The astronomical data used to calculate planetary positions must be precise. Reputable astrology software and calculators use highly accurate ephemerides.
- Precession of the Equinoxes: Astrologers use either the Tropical zodiac (based on seasons) or the Sidereal zodiac (based on constellations). The difference between them is the precession of the equinoxes. Most Western astrologers use the Tropical zodiac, while Vedic astrology uses the Sidereal. This calculator uses the Tropical zodiac.
Frequently Asked Questions (FAQ)
Q1: How accurate is an online astrology chart calculator?
A: The accuracy depends heavily on the quality of the astronomical data and algorithms used by the calculator, and most importantly, the accuracy of the birth information you provide. Our calculator uses standard astronomical calculations and requires precise birth details for the best results.
Q2: What's the difference between a Sun sign and an Ascendant?
A: Your Sun sign represents your core identity, ego, and vitality. Your Ascendant (Rising Sign) is the sign on the eastern horizon at your birth and represents your outward personality, how others perceive you, and your initial approach to life.
Q3: Do I need to know my exact birth time?
A: Yes, for a complete and accurate natal chart, especially for Ascendant and house placements, the exact birth time is crucial. Without it, the Ascendant and house cusps cannot be calculated accurately, making the chart incomplete.
Q4: What if I don't know my exact birth time?
A: If you don't know your exact birth time, you can still calculate your Sun, Moon, and planetary positions, which provide significant insights. However, the Ascendant and house placements will be based on a default time (like noon) or will be unavailable, limiting the chart's depth.
Q5: How do I find my birth latitude and longitude?
A: You can often find this information on your birth certificate. Alternatively, you can search online databases or historical records for your birth hospital or city. Many online tools can also help you find coordinates based on location names.
Q6: What are astrological houses?
A: The twelve houses represent different areas of life, such as self, finances, communication, home, career, relationships, etc. The house a planet falls into indicates the life area where that planet's energy is most likely to be expressed.
Q7: Can an astrology chart predict the future?
A: A natal chart itself is a map of potentials at birth, not a direct prediction of future events. Astrologers use techniques like transits and progressions, which compare current planetary movements to your natal chart, to analyze potential future trends and opportunities.
Q8: Is astrology a science?
A: Astrology is generally considered a pseudoscience. While it uses astronomical data, its interpretations and core tenets are not supported by empirical scientific evidence. However, many find it a valuable symbolic language for self-understanding and psychological exploration.
Related Tools and Internal Resources
// Placeholder for actual astronomical calculation logic.
// In a real-world scenario, this would involve complex libraries or custom algorithms
// to calculate planetary positions, house cusps, etc., based on date, time, and location.
// For this example, we'll use simplified mock data and logic.
var planets = ["Sun", "Moon", "Mercury", "Venus", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto"];
var signs = ["Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces"];
function getZodiacSign(degree) {
var signIndex = Math.floor(degree / 30);
return signs[signIndex];
}
function getDegreeInSign(degree) {
var degreeInSign = degree % 30;
var minutes = Math.floor((degreeInSign – Math.floor(degreeInSign)) * 60);
var seconds = Math.floor(((degreeInSign – Math.floor(degreeInSign)) * 60 – minutes) * 60);
return Math.floor(degreeInSign) + "° " + minutes + "' " + seconds + "\"";
}
// Mock function to simulate planetary position calculation
function calculatePlanetaryPositions(birthDate, birthTime, latitude, longitude, timezoneOffset) {
var positions = {};
var dateObj = new Date(birthDate + "T" + birthTime + "Z"); // Use UTC for consistency
var year = dateObj.getUTCFullYear();
var month = dateObj.getUTCMonth() + 1; // UTC months are 0-11
var day = dateObj.getUTCDate();
var hours = dateObj.getUTCHours();
var minutes = dateObj.getUTCMinutes();
var seconds = dateObj.getUTCSeconds();
// Simplified calculation: Use a fixed offset for demonstration
// Real calculations involve complex astronomical algorithms (e.g., JPL ephemerides)
var julianDay = calculateJulianDay(year, month, day, hours, minutes, seconds);
var siderealTime = calculateSiderealTime(julianDay, longitude);
// Mock planetary positions (these are NOT accurate astronomical calculations)
// In a real calculator, you'd use a library like `swisseph` or similar.
var mockPlanetDegrees = {
"Sun": (julianDay * 0.9856) % 360,
"Moon": (julianDay * 13.176) % 360,
"Mercury": (julianDay * 4.07) % 360,
"Venus": (julianDay * 1.60) % 360,
"Mars": (julianDay * 0.52) % 360,
"Jupiter": (julianDay * 0.08) % 360,
"Saturn": (julianDay * 0.03) % 360,
"Uranus": (julianDay * 0.01) % 360,
"Neptune": (julianDay * 0.005) % 360,
"Pluto": (julianDay * 0.002) % 360
};
// Calculate Ascendant and MC (simplified approximation)
var ascendantDegree = calculateAscendant(siderealTime, latitude);
var mcDegree = (siderealTime + 90) % 360; // Simplified MC calculation
positions.ascendant = { degree: ascendantDegree, sign: getZodiacSign(ascendantDegree), degreeInSign: getDegreeInSign(ascendantDegree) };
positions.mc = { degree: mcDegree, sign: getZodiacSign(mcDegree), degreeInSign: getDegreeInSign(mcDegree) };
// Assign mock degrees to planets
for (var i = 0; i < planets.length; i++) {
var planetName = planets[i];
var degree = mockPlanetDegrees[planetName] || (Math.random() * 360); // Fallback random
positions[planetName.toLowerCase()] = {
degree: degree,
sign: getZodiacSign(degree),
degreeInSign: getDegreeInSign(degree)
};
}
// Calculate Houses (using Placidus system approximation)
positions.houses = calculatePlacidusHouses(siderealTime, latitude);
// Assign planets to houses
for (var i = 0; i < planets.length; i++) {
var planetName = planets[i].toLowerCase();
var planetDegree = positions[planetName].degree;
for (var h = 0; h < positions.houses.length; h++) {
var houseStart = positions.houses[h].degree;
var houseEnd = positions.houses[(h + 1) % 12].degree;
if (houseEnd = houseStart && planetDegree < houseEnd) {
positions[planetName].house = h + 1;
break;
}
}
}
// Assign Ascendant and MC to houses
positions.ascendant.house = positions.houses.findIndex(function(house, index) {
var nextHouseIndex = (index + 1) % 12;
var houseStart = house.degree;
var houseEnd = positions.houses[nextHouseIndex].degree;
if (houseEnd = houseStart && positions.ascendant.degree < houseEnd;
}) + 1;
positions.mc.house = positions.houses.findIndex(function(house, index) {
var nextHouseIndex = (index + 1) % 12;
var houseStart = house.degree;
var houseEnd = positions.houses[nextHouseIndex].degree;
if (houseEnd = houseStart && positions.mc.degree < houseEnd;
}) + 1;
return positions;
}
// Simplified Julian Day calculation
function calculateJulianDay(year, month, day, hours, minutes, seconds) {
var h = hours + minutes / 60 + seconds / 3600;
var a = Math.floor((14 – month) / 12);
var y = year + 4800 – a;
var m = month + 12 * a – 3;
var JD = day + Math.floor((153 * m + 2) / 5) + 365 * y + Math.floor(y / 4) – Math.floor(y / 100) + Math.floor(y / 400) – 32045;
return JD + h / 24;
}
// Simplified Greenwich Sidereal Time calculation
function calculateSiderealTime(julianDay, longitude) {
var JD = julianDay – 2451545.0; // Julian centuries since J2000.0
var T = JD / 36525;
var GMST = 280.46061837 + 360.98564736629 * (julianDay – 2451545.0) + 0.000387933 * T * T – T * T * T / 38710000;
GMST = GMST % 360;
if (GMST < 0) GMST += 360;
var LST = GMST + longitude;
return LST % 360 < 0 ? LST % 360 + 360 : LST % 360;
}
// Simplified Ascendant calculation (using approximation)
function calculateAscendant(siderealTime, latitude) {
var latRad = latitude * Math.PI / 180;
var stRad = siderealTime * Math.PI / 180;
var tanAsc = -Math.cos(stRad) / Math.cos(latRad);
var asc = Math.atan(tanAsc) * 180 / Math.PI;
var quadrant = Math.atan2(Math.sin(stRad) * Math.cos(latRad), -Math.cos(stRad));
if (quadrant = Math.PI / 2 && quadrant < 3 * Math.PI / 2) {
asc += 180;
}
asc = asc % 360;
if (asc < 0) asc += 360;
return asc;
}
// Simplified Placidus House Calculation
function calculatePlacidusHouses(siderealTime, latitude) {
var houses = [];
var latRad = latitude * Math.PI / 180;
var stRad = siderealTime * Math.PI / 180;
for (var i = 0; i < 12; i++) {
var houseDegree = 0;
var houseNum = i + 1;
var A = (houseNum * 30 – 15) * Math.PI / 180; // Midheaven approximation
if (houseNum === 1) { // Ascendant
houseDegree = calculateAscendant(siderealTime, latitude);
} else if (houseNum === 10) { // Midheaven
houseDegree = (siderealTime + 90) % 360; // Simplified MC
} else {
// Placidus calculation is complex. This is a placeholder approximation.
// A real implementation requires iterative calculations or lookup tables.
// For demonstration, we'll use a simplified linear interpolation based on MC.
var mcApprox = (siderealTime + 90) % 360;
var ascApprox = calculateAscendant(siderealTime, latitude);
var diff = mcApprox – ascApprox;
if (diff < 0) diff += 360;
var factor = (houseNum – 1) / 11; // Crude interpolation factor
houseDegree = ascApprox + factor * diff;
if (houseNum === 7) houseDegree = (ascApprox + 180) % 360; // Descendant
if (houseNum === 4) houseDegree = (mcApprox + 180) % 360; // Nadir
}
// Ensure degrees are within 0-360
houseDegree = houseDegree % 360;
if (houseDegree today) {
errorSpan.textContent = "Date cannot be in the future.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
}
} else if (id === 'birthTime') {
// Basic time format check (HH:MM)
if (!/^\d{2}:\d{2}$/.test(value)) {
errorSpan.textContent = "Invalid time format. Use HH:MM.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
}
} else {
var numValue = parseFloat(value);
if (isNaN(numValue)) {
errorSpan.textContent = "Please enter a valid number.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
} else if (min !== undefined && max !== undefined && (numValue max)) {
errorSpan.textContent = "Value out of range. Must be between " + min + " and " + max + ".";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
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// Handle cases where input is just "." or similar non-numeric strings that parseFloat makes 0
errorSpan.textContent = "Please enter a valid number.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
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// Allow negative for coordinates, but check range
if (id === 'latitude' && (numValue 90)) {
errorSpan.textContent = "Latitude must be between -90 and 90.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
} else if (id === 'longitude' && (numValue 180)) {
errorSpan.textContent = "Longitude must be between -180 and 180.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
}
} else if (numValue < 0 && id !== 'timezone') { // General check for negative numbers where not applicable
errorSpan.textContent = "Value cannot be negative.";
errorSpan.classList.add('visible');
input.style.borderColor = '#dc3545';
isValid = false;
}
}
if (isValid) {
input.style.borderColor = '#28a745'; // Success color
}
return isValid;
}
function validateForm() {
var allValid = true;
allValid &= validateInput('birthDate', 'birthDateError');
allValid &= validateInput('birthTime', 'birthTimeError');
allValid &= validateInput('birthLocation', 'birthLocationError'); // Basic check, location lookup is complex
allValid &= validateInput('latitude', 'latitudeError', -90, 90);
allValid &= validateInput('longitude', 'longitudeError', -180, 180);
allValid &= validateInput('timezone', 'timezoneError'); // Check if selected
// Specific check for timezone if it's a select element
var timezoneInput = document.getElementById('timezone');
var timezoneErrorSpan = document.getElementById('timezoneError');
if (timezoneInput.value === "") {
timezoneErrorSpan.textContent = "Please select a timezone.";
timezoneErrorSpan.classList.add('visible');
timezoneInput.style.borderColor = '#dc3545';
allValid = false;
} else {
timezoneInput.style.borderColor = '#28a745';
}
return allValid;
}
function calculateAstrologyChart() {
if (!validateForm()) {
document.getElementById('results').classList.add('hidden');
return;
}
var birthDate = document.getElementById('birthDate').value;
var birthTime = document.getElementById('birthTime').value;
var birthLocation = document.getElementById('birthLocation').value;
var latitude = parseFloat(document.getElementById('latitude').value);
var longitude = parseFloat(document.getElementById('longitude').value);
var timezoneOffset = parseFloat(document.getElementById('timezone').value);
// Adjust birth time for timezone offset to get UTC time
var localDate = new Date(birthDate + "T" + birthTime);
var utcMillis = localDate.getTime() – (timezoneOffset * 60 * 60 * 1000);
var utcDate = new Date(utcMillis);
var utcBirthDate = utcDate.toISOString().split('T')[0];
var utcBirthTime = utcDate.toISOString().split('T')[1].split('.')[0];
var positions = calculatePlanetaryPositions(utcBirthDate, utcBirthTime, latitude, longitude, timezoneOffset);
// Update primary result
var sunSign = positions.sun.sign;
var ascendantSign = positions.ascendant.sign;
var mcSign = positions.mc.sign;
var sunDegree = positions.sun.degreeInSign;
var ascendantDegree = positions.ascendant.degreeInSign;
var mcDegree = positions.mc.degreeInSign;
document.getElementById('primaryResult').innerHTML = sunSign + " Sun, " + ascendantSign + " Ascendant, " + mcSign + " MC";
// Update intermediate results
document.getElementById('ascendantResult').innerHTML = "Ascendant:
" + ascendantSign + " " + ascendantDegree + "";
document.getElementById('mcResult').innerHTML = "Midheaven (MC):
" + mcSign + " " + mcDegree + "";
document.getElementById('sunSignResult').innerHTML = "Sun Sign:
" + sunSign + " " + sunDegree + "";
document.getElementById('moonSignResult').innerHTML = "Moon Sign:
" + positions.moon.sign + " " + positions.moon.degreeInSign + "";
// Update key assumptions
document.getElementById('assumptionDate').innerHTML = "Date:
" + birthDate + "";
document.getElementById('assumptionTime').innerHTML = "Time:
" + birthTime + " (Local)";
document.getElementById('assumptionLocation').innerHTML = "Location:
" + birthLocation + "";
// Populate planet positions table
var tableBody = document.getElementById('planetPositionsBody');
tableBody.innerHTML = "; // Clear previous data
for (var i = 0; i < planets.length; i++) {
var planetName = planets[i];
var planetData = positions[planetName.toLowerCase()];
if (planetData) {
var row = tableBody.insertRow();
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
cell1.textContent = planetName;
cell2.textContent = planetData.sign;
cell3.textContent = planetData.degreeInSign;
cell4.textContent = planetData.house !== undefined ? planetData.house : '-';
}
}
// Update chart data
updateZodiacDistributionChart(positions);
// Show results section
document.getElementById('results').classList.remove('hidden');
}
function updateZodiacDistributionChart(positions) {
var signCounts = {};
for (var i = 0; i < signs.length; i++) {
signCounts[signs[i]] = 0;
}
// Count planets in each sign
for (var i = 0; i < planets.length; i++) {
var planetName = planets[i].toLowerCase();
if (positions[planetName] && positions[planetName].sign) {
signCounts[positions[planetName].sign]++;
}
}
// Count Ascendant and MC
if (positions.ascendant && positions.ascendant.sign) {
signCounts[positions.ascendant.sign]++;
}
if (positions.mc && positions.mc.sign) {
signCounts[positions.mc.sign]++;
}
var labels = [];
var data = [];
for (var i = 0; i < signs.length; i++) {
labels.push(signs[i]);
data.push(signCounts[signs[i]]);
}
var ctx = document.getElementById('zodiacDistributionChart').getContext('2d');
// Destroy previous chart instance if it exists
if (window.zodiacChartInstance) {
window.zodiacChartInstance.destroy();
}
window.zodiacChartInstance = new Chart(ctx, {
type: 'bar',
data: {
labels: labels,
datasets: [{
label: 'Number of Planets/Points',
data: data,
backgroundColor: 'rgba(0, 74, 153, 0.6)',
borderColor: 'rgba(0, 74, 153, 1)',
borderWidth: 1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
ticks: {
stepSize: 1
}
}
},
plugins: {
legend: {
display: false // Legend handled separately
},
title: {
display: true,
text: 'Zodiac Sign Distribution of Celestial Bodies'
}
}
}
});
// Create legend
var legendHtml = '
Legend:
';
for (var i = 0; i < labels.length; i++) {
legendHtml += '- ' + labels[i] + ': ' + data[i] + '
';
}
legendHtml += '
';
document.getElementById('chartLegend').innerHTML = legendHtml;
}
function resetCalculator() {
document.getElementById('birthDate').value = ";
document.getElementById('birthTime').value = ";
document.getElementById('birthLocation').value = 'New York, NY, USA';
document.getElementById('latitude').value = '40.7128';
document.getElementById('longitude').value = '-74.0060';
document.getElementById('timezone').value = '-5'; // Default to EST
// Clear errors
var errorSpans = document.querySelectorAll('.error-message');
for (var i = 0; i < errorSpans.length; i++) {
errorSpans[i].textContent = '';
errorSpans[i].classList.remove('visible');
}
// Reset input borders
var inputs = document.querySelectorAll('.input-group input, .input-group select');
for (var i = 0; i < inputs.length; i++) {
inputs[i].style.borderColor = '#ccc';
}
document.getElementById('results').classList.add('hidden');
}
function copyResults() {
var resultsDiv = document.getElementById('results');
if (resultsDiv.classList.contains('hidden')) {
alert("Please calculate the chart first.");
return;
}
var primaryResult = document.getElementById('primaryResult').innerText;
var ascendantResult = document.getElementById('ascendantResult').innerText;
var mcResult = document.getElementById('mcResult').innerText;
var sunSignResult = document.getElementById('sunSignResult').innerText;
var moonSignResult = document.getElementById('moonSignResult').innerText;
var assumptionDate = document.getElementById('assumptionDate').innerText;
var assumptionTime = document.getElementById('assumptionTime').innerText;
var assumptionLocation = document.getElementById('assumptionLocation').innerText;
var table = document.getElementById('planetPositionsTable');
var tableRows = table.querySelectorAll('tbody tr');
var tableData = "Planetary Positions:\n";
tableRows.forEach(function(row) {
var cells = row.querySelectorAll('td');
tableData += cells[0].innerText + "\t" + cells[1].innerText + "\t" + cells[2].innerText + "\t" + cells[3].innerText + "\n";
});
var chartCanvas = document.getElementById('zodiacDistributionChart');
var chartLegend = document.getElementById('chartLegend').innerText;
var textToCopy = "— Your Natal Chart Snapshot —\n\n";
textToCopy += "Primary Result: " + primaryResult + "\n";
textToCopy += ascendantResult + "\n";
textToCopy += mcResult + "\n";
textToCopy += sunSignResult + "\n";
textToCopy += moonSignResult + "\n\n";
textToCopy += "Key Assumptions:\n";
textToCopy += assumptionDate + "\n";
textToCopy += assumptionTime + "\n";
textToCopy += assumptionLocation + "\n\n";
textToCopy += tableData + "\n";
textToCopy += "Zodiac Sign Distribution Chart:\n" + chartLegend;
// Use a temporary textarea to copy text
var textArea = document.createElement("textarea");
textArea.value = textToCopy;
textArea.style.position = "fixed";
textArea.style.left = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Results copied to clipboard!' : 'Failed to copy results.';
alert(msg);
} catch (err) {
alert('Oops, unable to copy');
}
document.body.removeChild(textArea);
}
// Initialize default values and potentially load a chart if parameters exist
document.addEventListener('DOMContentLoaded', function() {
resetCalculator(); // Set sensible defaults on load
// Optionally, add logic here to parse URL parameters and pre-fill the form
});
// Add event listeners for real-time updates (optional, but good UX)
var inputs = document.querySelectorAll('#calculatorForm input, #calculatorForm select');
for (var i = 0; i < inputs.length; i++) {
inputs[i].addEventListener('input', function() {
// Basic validation on input for immediate feedback
var id = this.id;
var errorId = id + 'Error';
var min = undefined, max = undefined;
if (id === 'latitude') { min = -90; max = 90; }
if (id === 'longitude') { min = -180; max = 180; }
validateInput(id, errorId, min, max);
});
inputs[i].addEventListener('change', function() {
// Recalculate if inputs change and form is valid
if (document.getElementById('results').classList.contains('hidden') || validateForm()) {
calculateAstrologyChart();
}
});
}
// Ensure Chart.js is loaded if you were using it.
// For this pure HTML/JS example, we'll assume a Chart.js CDN or local file is available.
// If not, you'd need to implement canvas drawing manually or use SVG.
// For this example, I'll include a placeholder for Chart.js initialization.
// In a real scenario, you'd add:
//
// before this script block.
// Placeholder for Chart.js initialization if not loaded via CDN
if (typeof Chart === 'undefined') {
console.warn("Chart.js not found. Chart will not render.");
// You might want to hide the chart canvas or display a message
document.getElementById('zodiacChartContainer').innerHTML = '
Chart.js library is required for the chart to display.
';
}