Unlock the secrets of the stars! Use our comprehensive online astrology calculators to generate and interpret your unique birth chart, explore current planetary transits, and gain insights into your personal astrological blueprint.
Natal Chart & Transit Calculator
Enter your birth date.
Enter your birth time (e.g., 14:30). If unknown, leave blank.
Enter your birthplace (e.g., New York, NY, USA).
Your Astrological Insights
Key Chart Elements:
Assumptions & Details:
Planetary Positions Overview
A visual representation of planetary placements in the zodiac signs for your natal chart.
What are Online Astrology Calculators?
Online astrology calculators are digital tools designed to generate astrological charts and provide interpretations based on birth data: date, time, and place of birth. These calculators automate the complex process of casting a natal chart (birth chart) and can also compute other astrological charts like transit charts, progression charts, or synastry charts. They leverage astronomical algorithms and astrological principles to determine the precise positions of celestial bodies (planets, the Sun, the Moon, asteroids) within the zodiac signs and astrological houses at a specific moment in time. Essentially, they serve as a digital bridge to the ancient wisdom of astrology, making it accessible to anyone with an internet connection. These tools are invaluable for both seasoned astrologers and curious beginners seeking to understand their unique cosmic blueprint and how celestial events might influence their lives. They help demystify complex astrological concepts and offer a starting point for self-discovery and personal growth. It's important to understand that these calculators provide data and potential interpretations; the depth of understanding often comes from personal reflection and potentially guidance from a professional astrologer.
Who Should Use Online Astrology Calculators?
Individuals exploring self-discovery: Anyone curious about their personality, strengths, challenges, and life path as indicated by their birth chart.
Beginners in astrology: Those new to the subject who want to generate their chart easily and begin learning about astrological concepts like zodiac signs, houses, and planetary aspects.
Astrology students and practitioners: Professionals and students can use these calculators for quick chart generation, preliminary analysis, or to check specific calculations before deeper dives.
People interested in relationships: Individuals wanting to compare their chart with a partner's (synastry) to understand relationship dynamics.
Those seeking timing insights: Users interested in understanding how current planetary movements (transits) might affect their personal life and decisions.
Common Misconceptions about Online Astrology Calculators
They predict the future with certainty: Astrology offers potentials and influences, not deterministic fate. Calculators provide data for interpretation, not absolute predictions.
All calculators are equally accurate: While most use standard astronomical data, variations in algorithms, databases (like ephemerides), and time zone handling can lead to slight differences. It's wise to use reputable calculators.
They replace human astrologers: Calculators are powerful tools for data generation, but the nuanced interpretation, synthesis, and personalized guidance often require the experience and intuition of a human astrologer.
Birth time is not important: The birth time is crucial for accurately determining the Ascendant (Rising Sign) and the placement of planets in the astrological houses, which significantly shapes the chart's interpretation.
Online Astrology Calculators: Formula and Mathematical Explanation
The core of any online astrology calculator involves precise astronomical calculations to determine celestial body positions. While the exact algorithms can be proprietary and complex, they are based on established astronomical models and data. The primary goal is to calculate the ecliptic longitude (position along the Sun's apparent path) of various celestial bodies (Sun, Moon, planets, etc.) at a specific moment in time and geographical location.
Core Calculations Involved:
Time Standardization: Input birth date and time are converted into a universal time standard, typically Coordinated Universal Time (UTC), accounting for the local time zone and any historical Daylight Saving Time (DST) rules applicable at the birth location and date.
Julian Day Calculation: The standardized UTC date and time are converted into a Julian Day Number (JDN), a continuous count of days since a specific epoch in the past. This is a standard astronomical way to represent time for calculations.
Ephemeris Data Interpolation: Astronomical ephemerides provide the precise positions of celestial bodies at regular intervals (e.g., daily or hourly). The calculator uses the JDN to interpolate the exact position of each body at the moment of birth. This is a highly complex process involving sophisticated mathematical formulas and extensive pre-computed data tables.
Coordinate Systems Transformation: Positions are often calculated in a geocentric (Earth-centered) coordinate system. These may need to be transformed into ecliptic coordinates (longitude and latitude relative to the Earth's orbital plane) to determine zodiacal positions.
House System Calculation: The Ascendant (Rising Sign) and Midheaven (MC) are calculated based on the birth latitude, longitude, and time. Different house systems (e.g., Placidus, Koch, Whole Sign) use different mathematical methods to divide the sky into 12 astrological houses. The Ascendant is the degree of the ecliptic rising over the eastern horizon at the moment of birth, and the MC is the degree culminating at the local meridian.
Aspect Calculation: Once planetary longitudes are known, the angular separation between pairs of planets is calculated. Astrologers define 'aspects' as specific angular relationships (e.g., conjunction 0°, opposition 180°, square 90°, trine 120°, sextile 60°) within a certain 'orb' (allowable deviation).
Variables Table
Here are the key variables typically used in online astrology calculators:
Key Astrological Variables
Variable
Meaning
Unit
Typical Range
Date of Birth (DOB)
The day, month, and year of birth.
Calendar Date
e.g., 1990-07-15
Time of Birth (TOB)
The precise time of birth. Crucial for Ascendant and House cusps.
HH:MM (UTC or Local)
00:00 – 23:59
Place of Birth (POB)
Geographical coordinates (latitude, longitude) of birth.
Degrees, Minutes, Seconds (or Decimal Degrees)
Latitude: -90° to +90°, Longitude: -180° to +180°
UTC Offset
Difference between local time and Coordinated Universal Time. Includes DST adjustments.
Hours
e.g., -12 to +14
Julian Day Number (JDN)
A continuous count of days, used as a time variable for astronomical calculations.
Days
Increases continuously (e.g., 2451545.0 for Jan 1, 2000 UTC)
Ecliptic Longitude (λ)
Position of a celestial body along the ecliptic (path of the Sun). Determines zodiac sign placement.
Degrees (0° to 360°)
0° to 359.99°
Ascendant (ASC) / Rising Sign
The zodiac sign rising on the eastern horizon at the exact time and place of birth.
Zodiac Sign / Degree
Aries to Pisces / 0° to 29.99°
Midheaven (MC)
The point in the sky at its highest altitude (culminating) at the time and place of birth.
Zodiac Sign / Degree
Aries to Pisces / 0° to 29.99°
House Cusp Degree
The starting degree of each of the 12 astrological houses.
Degree (0° to 29.99°)
0° to 29.99° per house
The calculation for the Ascendant (ASC) and Midheaven (MC) is particularly complex. It involves spherical trigonometry based on the observer's latitude, the sidereal time (which is based on the Earth's rotation relative to distant stars, often derived from the UTC and JDN), and astronomical models. The ecliptic longitude of the Ascendant is essentially the intersection of the ecliptic with the eastern horizon, while the MC is the intersection with the local meridian. These calculations are the foundation for the rest of the natal chart structure.
Practical Examples of Online Astrology Calculator Use
Online astrology calculators are versatile tools. Here are a couple of examples illustrating their application:
Example 1: Understanding Core Personality (Natal Chart)
Scenario: Sarah is curious about her core identity and emotional nature. She was born on June 5, 1995, at 10:15 AM in London, UK. She provides this information to an online astrology calculator.
Inputs:
Date of Birth: 1995-06-05
Time of Birth: 10:15
Place of Birth: London, UK
Calculator Output (Simplified):
Primary Result: Your Sun is in Gemini, Moon is in Cancer, and Ascendant (Rising Sign) is in Leo.
Sun Sign: Gemini
Moon Sign: Cancer
Ascendant (Rising Sign): Leo
Midheaven (MC): Taurus
Astrological Interpretation:
The calculator reveals Sarah's core identity (Sun) is in communicative and adaptable Gemini. Her emotional inner world and subconscious needs (Moon) are in nurturing and sensitive Cancer. Her outward personality and the way she presents herself to the world (Ascendant) is in confident and dramatic Leo. The MC in Taurus suggests her public image or career aspirations might relate to stability, resources, or aesthetics. This combination paints a picture of someone intellectually curious and social (Gemini Sun), who feels security through emotional connection and home (Cancer Moon), but projects a charismatic and leadership-oriented image (Leo Ascendant).
Example 2: Analyzing Current Influences (Transit Chart)
Scenario: John wants to understand why he's feeling particularly creative and inspired lately. He uses an online calculator to compare the current planetary positions (transits) to his natal chart (generated previously).
Natal Chart Snippet (Hypothetical): John's natal Sun is at 15° Aries, natal Moon at 20° Aquarius.
Current Date: October 26, 2023
Inputs for Transit Calculator: User's natal chart data + current date.
Calculator Output (Focusing on a key transit):
Primary Result: Transiting Mars is currently at 12° Scorpio, forming a square aspect to your natal Sun at 15° Aries.
Key Transit: Mars square Sun
Transit Position: Mars at 12° Scorpio
Natal Position: Sun at 15° Aries
Aspect: Square (90°)
Astrological Interpretation:
The calculator highlights a challenging aspect between transiting Mars and John's natal Sun. Mars, the planet of action and energy, in intense Scorpio, squaring the Sun (representing vitality and ego) in pioneering Aries, might indicate periods of frustration, conflict, or intense drive. This transit could be fueling his desire to push boundaries or face challenges head-on, leading to a feeling of heightened energy and perhaps a more aggressive approach to his goals. While potentially causing friction, this intense energy can also be channeled into focused action and overcoming obstacles, possibly contributing to his feeling of drive and motivation, although perhaps not directly 'creativity' in a gentle sense. A more nuanced look might reveal other transits contributing to creativity.
How to Use This Online Astrology Calculator
Using our online astrology calculator is straightforward. Follow these steps to generate your personalized astrological insights:
Enter Your Birth Date: Select your date of birth from the calendar picker. Accuracy is key!
Provide Your Birth Time: Input your birth time in the 24-hour format (HH:MM). If you don't know your exact birth time, you can leave this field blank. However, be aware that without a precise birth time, the Ascendant (Rising Sign) and house placements cannot be accurately calculated, significantly limiting the chart's interpretation.
Specify Your Birth Location: Enter the city, state/province, and country where you were born. The calculator uses this information to determine your precise geographical coordinates and local time zone.
Click 'Calculate Chart': Once all required information is entered, click the button. The calculator will process your data and display your astrological chart details.
Review Your Results: The calculator will show your primary astrological placements (Sun, Moon, Ascendant, Midheaven), along with key intermediate values and assumptions made during the calculation (like timezone). A visual chart will also be generated.
How to Read Your Results:
Primary Result: This offers a quick summary, often highlighting your Sun, Moon, and Ascendant signs – considered the "big three" in astrology for understanding personality.
Key Chart Elements: Detailed placements of your Sun, Moon, Ascendant, and Midheaven in zodiac signs.
Assumptions & Details: Information about the input data used and the timezone applied for accuracy.
Planetary Chart: A visual representation (often a wheel chart) showing the signs and houses occupied by all major planets.
Decision-Making Guidance:
Your astrological chart is a map of potentials, not a fixed destiny. Use the insights gained from the calculator to:
Gain Self-Awareness: Understand your inherent strengths, weaknesses, emotional patterns, and communication styles.
Identify Life Themes: Recognize recurring patterns or areas of focus indicated by your house placements and planetary aspects.
Navigate Challenges: See potential areas of difficulty and develop strategies to work with them constructively.
Understand Relationships: If using a synastry calculator, gain insights into relational dynamics.
Inform Personal Growth: Use astrological insights as a framework for personal development and decision-making.
Remember, the calculator provides the astrological 'data'. Deeper understanding often comes from journaling, reflection, and potentially consulting with a professional astrologer for a personalized interpretation.
Key Factors That Affect Online Astrology Calculator Results
The accuracy and depth of results from online astrology calculators depend on several critical factors. Ensuring these are correctly input and understood is vital for meaningful interpretation:
Accuracy of Birth Time: This is arguably the most critical factor. The Ascendant (Rising Sign) and the house cusps change approximately every 2 hours. Even a few minutes' error can shift these significantly, altering the house placements of planets and the interpretation of the chart's structure. Without an accurate birth time, the chart is considered ' ' and primarily reflects only the Sun, Moon, and potentially Mercury/Venus placements relative to the tropics.
Precision of Birth Location: The exact latitude and longitude of the birthplace are essential for calculating the Ascendant and Midheaven, as these are tied to the local horizon and meridian. While a city name is usually sufficient for reputable calculators which have databases of coordinates, providing a more specific location if available can enhance precision, especially for very remote areas or places with multiple nearby cities.
Correct Time Zone and Daylight Saving Time (DST) Handling: Calculators must accurately convert the entered local birth time to UTC. This requires knowing the correct time zone for the birth location *at the time of birth* and whether DST was in effect. Errors here are common because DST rules have changed historically and vary by region. Most modern calculators use sophisticated databases to handle this automatically, but manual entry or older calculators might be prone to errors.
Choice of House System: There are numerous astrological house systems (e.g., Placidus, Koch, Whole Sign, Equal House). Each system divides the 360° ecliptic differently, leading to different house cusp placements for planets. While the planetary positions in zodiac signs remain the same across systems, their 'address' within the houses can vary. The most common system is Placidus, but some astrologers prefer others based on their interpretive style. The calculator should ideally allow you to select your preferred system or state which one it uses.
Ephemeris Data and Calculation Algorithms: The underlying astronomical data (ephemeris) used by the calculator dictates the precise positions of celestial bodies. While major bodies' positions are well-documented, the accuracy of calculations depends on the quality and recency of this data, as well as the sophistication of the interpolation algorithms used to determine positions between recorded data points. Reputable calculators use highly accurate, modern ephemerides.
Orb Definitions for Aspects: Astrological aspects (angles between planets) are rarely exact. Astrologers use an 'orb' – a degree of tolerance – to determine if an aspect is considered active. For example, a Sun-Moon conjunction might have an orb of 8°, meaning it's considered a conjunction if the planets are within 8° of each other. Different astrologers and traditions may use varying orb widths, which can influence the number and significance of aspects highlighted in an interpretation. Calculators typically use standard or customizable orb settings.
Interpretation Software vs. Raw Data: Some calculators provide only raw data (planet degrees, sign placements, house cusps), while others include interpretive text. The quality of the interpretation depends heavily on the astrologer or system that generated the text. Raw data calculators are more flexible for experienced users, while interpretive ones are helpful for beginners but may offer generic or limited insights.
Frequently Asked Questions (FAQ) about Online Astrology Calculators
Is my birth information kept private?
Reputable online astrology calculators prioritize user privacy. Look for a clear privacy policy. Generally, your birth data is used solely for the calculation you request and is not stored long-term or shared without your explicit consent. However, always review the specific calculator's privacy terms.
What is the difference between a Sun sign, Moon sign, and Ascendant?
Your Sun sign represents your core identity, ego, and vitality (what you are). Your Moon sign reflects your emotional nature, subconscious needs, and instincts (how you feel). Your Ascendant (Rising Sign) is the sign on the eastern horizon at your birth, representing your outward personality, physical appearance, and how others first perceive you (how you appear).
Can I get an accurate chart if I don't know my exact birth time?
You can still generate a chart using just the date and place of birth, which will show your Sun, Moon, and planet placements in signs. However, without the birth time, the Ascendant and the house system cannot be accurately determined. This means the chart's structure – where planets fall in different life areas (houses) – will be missing, making a full interpretation impossible. Such charts are sometimes called 'whole sign' charts without a defined Ascendant or are calculated using a noon-time Ascendant as a placeholder.
How accurate are the planetary positions calculated?
Modern online astrology calculators use highly accurate astronomical data (ephemerides) and sophisticated algorithms. The positions of major planets are generally calculated with very high precision, often down to minutes or seconds of arc. The primary sources of potential discrepancy usually lie in the handling of time zones, historical DST adjustments, or the specific interpolation methods used.
What is a "transit" in astrology?
A transit occurs when a currently moving planet (e.g., Mars today, Jupiter next year) forms a significant aspect (angle) to a planet or point in your natal (birth) chart. Transit calculators help you understand these ongoing celestial influences and how they might interact with your personal astrological makeup, suggesting periods of opportunity, challenge, or change.
Can these calculators be used for predicting specific events?
Astrology is generally considered a tool for understanding potentials, tendencies, and timing rather than predicting specific, unavoidable events. Online calculators provide the data (natal charts, transits) that an astrologer uses for interpretation. While transits can indicate periods where certain themes are activated, they don't guarantee specific outcomes. Personal free will and context play significant roles.
Do different house systems yield vastly different results?
The zodiacal signs in which planets fall remain constant regardless of the house system used. However, the house cusps (the boundaries of the 12 houses) can shift, meaning a planet might fall into a different house depending on the system (e.g., Placidus vs. Whole Sign). This affects interpretations related to specific life areas (career, relationships, home, etc.). Experienced astrologers often consider multiple house systems or have a preferred one.
Are there any limitations to using online astrology calculators?
Yes, limitations include: the need for accurate birth data (especially time), the potential for generic interpretations in calculators that include text, the complexity of synthesizing a full chart which often requires human intuition, and the fact that calculators typically focus on core components (planets, signs, houses, major aspects) and may not include lesser-known points like asteroids or Arabic parts unless specifically designed to do so.
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// Placeholder data for planets and signs – in a real scenario, these would be dynamic or loaded from a library
var planetData = {
"Sun": {"sign": "Aries", "degree": 15.2, "house": 9},
"Moon": {"sign": "Aquarius", "degree": 22.7, "house": 8},
"Mercury": {"sign": "Taurus", "degree": 5.1, "house": 10},
"Venus": {"sign": "Gemini", "degree": 18.9, "house": 11},
"Mars": {"sign": "Cancer", "degree": 28.4, "house": 12},
"Jupiter": {"sign": "Leo", "degree": 10.0, "house": 1},
"Saturn": {"sign": "Virgo", "degree": 7.5, "house": 2},
"Uranus": {"sign": "Pisces", "degree": 25.0, "house": 9},
"Neptune": {"sign": "Capricorn", "degree": 12.1, "house": 7},
"Pluto": {"sign": "Scorpio", "degree": 29.9, "house": 3}
};
var zodiacSigns = ["Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces"];
function getZodiacSign(degree) {
var signIndex = Math.floor(degree / 30);
return zodiacSigns[signIndex];
}
function formatTime(hours, minutes) {
var ampm = hours >= 12 ? 'PM' : 'AM';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
return hours + ':' + minutes + ' ' + ampm;
}
function calculateAstrology() {
var birthDateInput = document.getElementById("birthDate");
var birthTimeInput = document.getElementById("birthTime");
var birthLocationInput = document.getElementById("birthLocation");
var errors = false;
// Clear previous errors
document.getElementById("birthDateError").classList.remove("visible");
document.getElementById("birthTimeError").classList.remove("visible");
document.getElementById("birthLocationError").classList.remove("visible");
// — Validation —
if (!birthDateInput.value) {
document.getElementById("birthDateError").innerText = "Date of birth is required.";
document.getElementById("birthDateError").classList.add("visible");
errors = true;
}
var birthTimeValue = birthTimeInput.value.trim();
var birthTimeParts = birthTimeValue.match(/^(\d{1,2}):(\d{2})$/);
var birthHour = null;
var birthMinute = null;
if (birthTimeValue && !birthTimeParts) {
document.getElementById("birthTimeError").innerText = "Invalid time format. Use HH:MM (e.g., 14:30).";
document.getElementById("birthTimeError").classList.add("visible");
errors = true;
} else if (birthTimeParts) {
birthHour = parseInt(birthTimeParts[1], 10);
birthMinute = parseInt(birthTimeParts[2], 10);
if (birthHour 23 || birthMinute 59) {
document.getElementById("birthTimeError").innerText = "Time values out of range (00:00 – 23:59).";
document.getElementById("birthTimeError").classList.add("visible");
errors = true;
}
}
if (!birthLocationInput.value.trim()) {
document.getElementById("birthLocationError").innerText = "Place of birth is required.";
document.getElementById("birthLocationError").classList.add("visible");
errors = true;
}
if (errors) {
document.getElementById("resultsSection").style.display = "none";
return;
}
// — Calculation Logic (Simplified Placeholder) —
// In a real application, this would involve complex astronomical calculations
// using libraries or precise algorithms for Julian date conversion, ephemeris lookup,
// coordinate transformations, and house system calculations.
// For this example, we'll use hardcoded/simplified values and logic.
var birthDate = new Date(birthDateInput.value);
var year = birthDate.getFullYear();
var month = birthDate.getMonth(); // 0-indexed
var day = birthDate.getDate();
// Get timezone offset (simplified: uses current system setting which might be inaccurate for past dates)
// A real calculator needs a robust timezone lookup service based on location and date.
var timezoneOffsetMinutes = birthDate.getTimezoneOffset();
var timezoneOffsetHours = timezoneOffsetMinutes / 60;
var timezoneString = "UTC" + (timezoneOffsetHours > 0 ? "-" : "+") + Math.abs(timezoneOffsetHours).toString().padStart(2, '0') + ":00";
var utcYear = birthDate.getUTCFullYear();
var utcMonth = birthDate.getUTCMonth();
var utcDay = birthDate.getUTCDate();
var utcHours = birthTimeValue ? parseInt(birthTimeParts[1], 10) – timezoneOffsetHours : 12; // Assume noon if time unknown
var utcMinutes = birthTimeValue ? parseInt(birthTimeParts[2], 10) : 0;
// Ensure time components are valid for UTC date construction
var utcDate = new Date(Date.UTC(utcYear, utcMonth, utcDay, utcHours, utcMinutes));
var julianDay = (utcDate.getTime() / 86400000) + 2440587.5; // Approximate Julian Day calculation for simplicity
// — Simplified Planet Position Calculation —
// This is highly INACCURATE and only for demonstration.
// Real calculations require precise ephemeris data and algorithms.
var sunLongitude = (julianDay / 365.25) * 360 % 360;
var moonLongitude = (julianDay / 27.32) * 360 % 360;
var mercuryLongitude = (sunLongitude + 45) % 360; // Example offset
var venusLongitude = (sunLongitude – 30) % 360; // Example offset
var marsLongitude = (sunLongitude + 90) % 360; // Example offset
var calculatedPlanetData = {
"Sun": {"sign": getZodiacSign(sunLongitude), "degree": sunLongitude % 30, "house": Math.floor(sunLongitude / 30) + 1},
"Moon": {"sign": getZodiacSign(moonLongitude), "degree": moonLongitude % 30, "house": Math.floor(moonLongitude / 30) + 1},
"Mercury": {"sign": getZodiacSign(mercuryLongitude), "degree": mercuryLongitude % 30, "house": Math.floor(mercuryLongitude / 30) + 1},
"Venus": {"sign": getZodiacSign(venusLongitude), "degree": venusLongitude % 30, "house": Math.floor(venusLongitude / 30) + 1},
"Mars": {"sign": getZodiacSign(marsLongitude), "degree": marsLongitude % 30, "house": Math.floor(marsLongitude / 30) + 1},
// Add other planets here with similarly simplified logic
"Jupiter": {"sign": getZodiacSign((sunLongitude + 120) % 360), "degree": ((sunLongitude + 120) % 360) % 30, "house": Math.floor(((sunLongitude + 120) % 360) / 30) + 1},
"Saturn": {"sign": getZodiacSign((sunLongitude + 210) % 360), "degree": ((sunLongitude + 210) % 360) % 30, "house": Math.floor(((sunLongitude + 210) % 360) / 30) + 1},
"Uranus": {"sign": getZodiacSign((sunLongitude + 300) % 360), "degree": ((sunLongitude + 300) % 360) % 30, "house": Math.floor(((sunLongitude + 300) % 360) / 30) + 1},
"Neptune": {"sign": getZodiacSign((sunLongitude + 150) % 360), "degree": ((sunLongitude + 150) % 360) % 30, "house": Math.floor(((sunLongitude + 150) % 360) / 30) + 1},
"Pluto": {"sign": getZodiacSign((sunLongitude + 60) % 360), "degree": ((sunLongitude + 60) % 360) % 30, "house": Math.floor(((sunLongitude + 60) % 360) / 30) + 1}
};
// Simplified Ascendant & MC Calculation (Highly Inaccurate)
// Real calculation depends heavily on latitude, longitude, and sidereal time.
var ascendantLongitude = (sunLongitude + 70) % 360; // Placeholder offset
var midheavenLongitude = (sunLongitude + 160) % 360; // Placeholder offset
var ascendantSign = getZodiacSign(ascendantLongitude);
var midheavenSign = getZodiacSign(midheavenLongitude);
// Determine primary result based on Sun, Moon, Ascendant
var sunSign = calculatedPlanetData["Sun"].sign;
var moonSign = calculatedPlanetData["Moon"].sign;
var ascendantSignResult = ascendantSign; // Use the calculated ascendant sign
var primaryResultText = "Your Sun is in " + sunSign + ", Moon is in " + moonSign + ", and Ascendant is in " + ascendantSignResult + ".";
document.getElementById("primaryResult").innerText = primaryResultText;
document.getElementById("sunSign").innerHTML = "Sun Sign: " + sunSign;
document.getElementById("moonSign").innerHTML = "Moon Sign: " + moonSign;
document.getElementById("risingSign").innerHTML = "Ascendant (Rising Sign): " + ascendantSignResult;
document.getElementById("midheaven").innerHTML = "Midheaven (MC): " + midheavenSign;
var formattedBirthTime = birthTimeValue ? formatTime(parseInt(birthTimeParts[1], 10), parseInt(birthTimeParts[2], 10)) : "Unknown";
document.getElementById("birthDateTime").innerHTML = "Birth Date & Time: " + birthDateInput.value + " " + formattedBirthTime;
document.getElementById("birthLocationDetail").innerHTML = "Birth Location: " + birthLocationInput.value;
document.getElementById("timezoneUsed").innerHTML = "Timezone Used: " + timezoneString + " (Approximate)";
var formulaExplanation = "The core calculation involves determining the precise ecliptic longitude of celestial bodies at the moment of birth using astronomical data and algorithms. This calculator uses simplified approximations for demonstration. Key results like the Ascendant and Midheaven are derived from birth time, latitude, and longitude.";
document.getElementById("formulaExplanation").innerText = formulaExplanation;
document.getElementById("resultsSection").style.display = "block";
// Update chart
updatePlanetaryChart(calculatedPlanetData, ascendantSignResult, midheavenSign);
}
function resetCalculator() {
document.getElementById("birthDate").value = "";
document.getElementById("birthTime").value = "";
document.getElementById("birthLocation").value = "";
document.getElementById("birthDateError").innerText = "";
document.getElementById("birthDateError").classList.remove("visible");
document.getElementById("birthTimeError").innerText = "";
document.getElementById("birthTimeError").classList.remove("visible");
document.getElementById("birthLocationError").innerText = "";
document.getElementById("birthLocationError").classList.remove("visible");
document.getElementById("resultsSection").style.display = "none";
// Clear chart if needed, or reset to default view
var canvas = document.getElementById('planetaryChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function copyResults() {
var primaryResult = document.getElementById("primaryResult").innerText;
var sunSign = document.getElementById("sunSign").innerText;
var moonSign = document.getElementById("moonSign").innerText;
var risingSign = document.getElementById("risingSign").innerText;
var midheaven = document.getElementById("midheaven").innerText;
var birthDateTime = document.getElementById("birthDateTime").innerText;
var birthLocationDetail = document.getElementById("birthLocationDetail").innerText;
var timezoneUsed = document.getElementById("timezoneUsed").innerText;
var formula = document.getElementById("formulaExplanation").innerText;
var resultsText = "— Astrological Insights —\n\n";
resultsText += primaryResult + "\n\n";
resultsText += "— Key Chart Elements —\n";
resultsText += sunSign + "\n";
resultsText += moonSign + "\n";
resultsText += risingSign + "\n";
resultsText += midheaven + "\n\n";
resultsText += "— Assumptions & Details —\n";
resultsText += birthDateTime + "\n";
resultsText += birthLocationDetail + "\n";
resultsText += timezoneUsed + "\n\n";
resultsText += "— Formula Basis —\n";
resultsText += formula + "\n";
// Use Clipboard API
navigator.clipboard.writeText(resultsText).then(function() {
// Success feedback (optional)
alert("Results copied to clipboard!");
}).catch(function(err) {
console.error('Failed to copy results: ', err);
// Fallback for older browsers or environments where clipboard API is restricted
var textArea = document.createElement("textarea");
textArea.value = resultsText;
textArea.style.position = "fixed"; // Avoid scrolling to bottom
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Fallback: Copying text command was ' + msg);
alert("Results copied to clipboard (Fallback)!");
} catch (err) {
console.error('Fallback: Unable to copy', err);
alert("Could not copy results automatically. Please select and copy manually.");
}
document.body.removeChild(textArea);
});
}
// — Charting Logic (using Canvas API) —
function updatePlanetaryChart(planetData, ascendant, midheaven) {
var canvas = document.getElementById('planetaryChart');
var ctx = canvas.getContext('2d');
var chartWidth = canvas.width;
var chartHeight = canvas.height;
var centerX = chartWidth / 2;
var centerY = chartHeight / 2;
var radius = Math.min(chartWidth, chartHeight) / 2 – 30; // Radius of the outer circle
// Clear previous drawing
ctx.clearRect(0, 0, chartWidth, chartHeight);
// Draw background and outer circle
ctx.fillStyle = '#f8f9fa';
ctx.fillRect(0, 0, chartWidth, chartHeight);
ctx.strokeStyle = '#004a99′;
ctx.lineWidth = 2;
ctx.beginPath();
ctx.arc(centerX, centerY, radius, 0, 2 * Math.PI);
ctx.stroke();
// Draw Zodiac Sign Markers (simplified)
ctx.font = '14px Segoe UI';
ctx.fillStyle = '#004a99';
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
for (var i = 0; i < zodiacSigns.length; i++) {
var angle = (i * 30 – 90) * Math.PI / 180; // -90 to start Aries at the top
var signX = centerX + (radius + 20) * Math.cos(angle);
var signY = centerY + (radius + 20) * Math.sin(angle);
ctx.fillText(zodiacSigns[i], signX, signY);
}
// Draw Ascendant and Midheaven markers (simplified representation)
var ascendantAngle = (zodiacSigns.indexOf(ascendant) * 30 – 90) * Math.PI / 180; // Approximate based on sign start
var mcAngle = (zodiacSigns.indexOf(midheaven) * 30 – 90) * Math.PI / 180; // Approximate
ctx.strokeStyle = '#28a745'; // Success color for ASC/MC
ctx.lineWidth = 2;
// Ascendant Marker (East Horizon)
var ascendantMarkerRadius = radius + 15;
var ascendantX = centerX + ascendantMarkerRadius * Math.cos(ascendantAngle);
var ascendantY = centerY + ascendantMarkerRadius * Math.sin(ascendantAngle);
ctx.beginPath();
ctx.moveTo(centerX, centerY);
ctx.lineTo(ascendantX, ascendantY);
ctx.stroke();
ctx.fillStyle = '#28a745';
ctx.font = 'bold 12px Segoe UI';
ctx.fillText('ASC', ascendantX + 10, ascendantY + 10);
// Midheaven Marker (South – top for wheel chart representation)
var mcMarkerRadius = radius + 15;
// MC angle needs careful calculation based on local meridian crossing. Simplified: Assume 0 degrees for MC if Aries MC, etc.
// For visual simplicity, let's place MC marker roughly at the top, corresponding to 0 or 360 degrees ecliptic longitude.
var mcAngleVisual = -90 * Math.PI / 180; // Straight up
var mcX = centerX + mcMarkerRadius * Math.cos(mcAngleVisual);
var mcY = centerY + mcMarkerRadius * Math.sin(mcAngleVisual);
ctx.beginPath();
ctx.moveTo(centerX, centerY);
ctx.lineTo(mcX, mcY);
ctx.stroke();
ctx.fillStyle = '#28a745';
ctx.font = 'bold 12px Segoe UI';
ctx.fillText('MC', mcX , mcY – 10);
// Draw planets
ctx.font = '12px Segoe UI';
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
var planetSymbols = {
"Sun": "☉", "Moon": "☽", "Mercury": "☿", "Venus": "♀", "Mars": "♂",
"Jupiter": "♃", "Saturn": "♄", "Uranus": "♅", "Neptune": "♆", "Pluto": "♇"
};
var planetColors = {
"Sun": "#FFD700", "Moon": "#C0C0C0", "Mercury": "#808080", "Venus": "#FFB6C1", "Mars": "#FF4500",
"Jupiter": "#DAA520", "Saturn": "#8B4513", "Uranus": "#ADD8E6", "Neptune": "#87CEEB", "Pluto": "#4B0082"
};
// Use the actual calculated data for drawing positions
for (var planetName in planetData) {
if (planetData.hasOwnProperty(planetName)) {
var data = planetData[planetName];
var currentLongitude = (zodiacSigns.indexOf(data.sign) * 30) + data.degree; // Ecliptic longitude 0-360
var angle = (currentLongitude – 90) * Math.PI / 180; // Convert to radians, adjust for 0 degrees at top
var planetRadius = radius – 30; // Inner circle for planets
var planetX = centerX + planetRadius * Math.cos(angle);
var planetY = centerY + planetRadius * Math.sin(angle);
// Draw planet symbol
ctx.fillStyle = planetColors[planetName] || '#000000';
ctx.font = '20px Symbol'; // Use a font that supports these symbols if available, or fallback text
ctx.fillText(planetSymbols[planetName] || planetName.charAt(0), planetX, planetY);
// Add label below the symbol
ctx.fillStyle = '#333';
ctx.font = '11px Segoe UI';
ctx.fillText(planetName, planetX, planetY + 20); // Adjust Y offset for label
}
}
// Add a legend or explanation
ctx.fillStyle = '#333';
ctx.font = '12px Segoe UI';
ctx.textAlign = 'left';
ctx.fillText("Chart shows approximate planetary positions.", 20, chartHeight – 20);
}
// Initial chart rendering on load (optional, can be empty)
// updatePlanetaryChart({}, "", "");