Ascendant (Rising): Your social personality and how others see you.
Understanding Your Birth Chart
A birth chart, also known as a natal chart, is a snapshot of the sky at the exact moment and location of your birth. It serves as a cosmic blueprint of your personality, strengths, and life path. While most people only know their "Zodiac Sign" (the Sun Sign), a complete chart includes the positions of the Moon and all the planets.
The Big Three
In modern astrology, the "Big Three" are the most critical components to understand your basic nature:
The Sun: Represents your core essence, vitality, and the "hero" you are becoming.
The Moon: Governs your subconscious, your moods, and how you process emotions.
The Rising (Ascendant): This is the sign that was rising on the eastern horizon at your birth. It represents your physical appearance and the first impression you make.
Example Calculation
Example Profile:
Birth Date: October 15, 1990
Birth Time: 10:30 AM
Location: Los Angeles, CA Result: Sun in Libra, Moon in Virgo, Sagittarius Rising.
Why Latitude and Longitude Matter?
Your Rising sign changes roughly every two hours. Without your exact birth time and geographic coordinates (latitude and longitude), it is impossible to calculate the Ascendant or the House placements of your planets. Even a 30-minute difference in birth time can shift your Rising sign entirely!
function calculateBirthChart() {
var dateVal = document.getElementById("birthDate").value;
var timeVal = document.getElementById("birthTime").value;
var lat = parseFloat(document.getElementById("birthLat").value);
var lon = parseFloat(document.getElementById("birthLong").value);
var offset = parseFloat(document.getElementById("timezone").value);
if (!dateVal || !timeVal || isNaN(lat) || isNaN(lon)) {
alert("Please fill in all fields correctly.");
return;
}
var birthDate = new Date(dateVal + 'T' + timeVal);
var year = birthDate.getFullYear();
var month = birthDate.getMonth() + 1;
var day = birthDate.getDate();
var hour = birthDate.getHours();
var min = birthDate.getMinutes();
// 1. Calculate Sun Sign (Simplified date-based)
var sunSign = getSunSign(month, day);
// 2. Calculate Julian Date for Moon/Ascendant logic
var utcHour = hour – offset;
var jd = calculateJulianDate(year, month, day, utcHour, min);
// 3. Approximate Moon Sign
// Moon moves ~13.17 degrees per day.
// Reference: Jan 1, 2000, 12:00 UTC, Moon was approx 194.5 degrees (Libra)
var jdRef = 2451545.0;
var daysSince = jd – jdRef;
var moonDeg = (194.5 + (13.17639 * daysSince)) % 360;
if (moonDeg = 21) || (month == 4 && day = 20) || (month == 5 && day = 21) || (month == 6 && day = 21) || (month == 7 && day = 23) || (month == 8 && day = 23) || (month == 9 && day = 23) || (month == 10 && day = 23) || (month == 11 && day = 22) || (month == 12 && day = 22) || (month == 1 && day = 20) || (month == 2 && day <= 18)) return "Aquarius";
return "Pisces";
}
function getSignFromDeg(deg) {
var signs = ["Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces"];
var index = Math.floor(deg / 30);
return signs[index % 12];
}
function calculateJulianDate(y, m, d, h, min) {
if (m <= 2) { y -= 1; m += 12; }
var a = Math.floor(y / 100);
var b = 2 – a + Math.floor(a / 4);
var jd = Math.floor(365.25 * (y + 4716)) + Math.floor(30.6001 * (m + 1)) + d + b – 1524.5;
jd += (h + min / 60.0) / 24.0;
return jd;
}
function getElement(sign) {
var elements = {
"Aries": "Fire", "Leo": "Fire", "Sagittarius": "Fire",
"Taurus": "Earth", "Virgo": "Earth", "Capricorn": "Earth",
"Gemini": "Air", "Libra": "Air", "Aquarius": "Air",
"Cancer": "Water", "Scorpio": "Water", "Pisces": "Water"
};
return elements[sign];
}