.calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f9f9f9;
border: 1px solid #ddd;
border-radius: 8px;
padding: 25px;
max-width: 500px;
margin: 30px auto;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 25px;
font-size: 1.8em;
}
.calculator-form .form-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.calculator-form label {
margin-bottom: 8px;
color: #555;
font-size: 0.95em;
font-weight: 600;
}
.calculator-form input[type="number"],
.calculator-form select {
padding: 12px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1em;
width: 100%;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.calculator-form input[type="number"]:focus,
.calculator-form select:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}
.calculator-form button {
background-color: #007bff;
color: white;
padding: 14px 25px;
border: none;
border-radius: 5px;
font-size: 1.1em;
cursor: pointer;
width: 100%;
box-sizing: border-box;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
.calculator-form button:hover {
background-color: #0056b3;
transform: translateY(-2px);
}
.calculator-form button:active {
transform: translateY(0);
}
.calculator-result {
margin-top: 30px;
padding: 20px;
background-color: #e9f7ff;
border: 1px solid #b3e0ff;
border-radius: 8px;
text-align: center;
font-size: 1.2em;
color: #0056b3;
min-height: 50px;
display: flex;
align-items: center;
justify-content: center;
font-weight: 600;
}
.calculator-result strong {
color: #003c80;
}
function calculateRisingSign() {
var birthMonth = parseInt(document.getElementById('birthMonth').value);
var birthDay = parseInt(document.getElementById('birthDay').value);
var birthYear = parseInt(document.getElementById('birthYear').value);
var birthHour = parseInt(document.getElementById('birthHour').value);
var birthMinute = parseInt(document.getElementById('birthMinute').value);
var birthLatitude = parseFloat(document.getElementById('birthLatitude').value);
var birthLongitude = parseFloat(document.getElementById('birthLongitude').value);
var timeZoneOffset = parseFloat(document.getElementById('timeZoneOffset').value);
var resultDiv = document.getElementById('risingSignResult');
// Input validation
if (isNaN(birthMonth) || isNaN(birthDay) || isNaN(birthYear) || isNaN(birthHour) || isNaN(birthMinute) ||
isNaN(birthLatitude) || isNaN(birthLongitude) || isNaN(timeZoneOffset)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (birthDay 31 || birthMonth 12 || birthYear 2099) {
resultDiv.innerHTML = "Please enter a valid birth date.";
return;
}
if (birthHour 23 || birthMinute 59) {
resultDiv.innerHTML = "Please enter a valid birth time (24-hour format).";
return;
}
if (birthLatitude 90) {
resultDiv.innerHTML = "Latitude must be between -90 and 90.";
return;
}
if (birthLongitude 180) {
resultDiv.innerHTML = "Longitude must be between -180 and 180.";
return;
}
if (timeZoneOffset 14) {
resultDiv.innerHTML = "Time Zone Offset must be between -12 and +14.";
return;
}
// — Astronomical Calculations —
// 1. Convert local time to Universal Time (UT)
var totalMinutes = birthHour * 60 + birthMinute;
var utHours = (totalMinutes / 60) – timeZoneOffset;
// Adjust UT to be within 0-24 hours and handle date change
var utDay = birthDay;
var utMonth = birthMonth;
var utYear = birthYear;
if (utHours = 24) {
utHours -= 24;
utDay++;
}
// Handle month/year changes due to UT day adjustment
var date = new Date(utYear, utMonth – 1, utDay); // Month is 0-indexed
utYear = date.getFullYear();
utMonth = date.getMonth() + 1;
utDay = date.getDate();
// 2. Calculate Julian Date (JD) for 0h UT of the day
// Algorithm from Jean Meeus, Astronomical Algorithms, 2nd Ed., Chapter 7
var Y = utYear;
var M = utMonth;
var D = utDay;
if (M <= 2) {
Y–;
M += 12;
}
var A = Math.floor(Y / 100);
var B = 2 – A + Math.floor(A / 4); // For Gregorian calendar
var JD = Math.floor(365.25 * (Y + 4716)) + Math.floor(30.6001 * (M + 1)) + D + B – 1524.5;
// Add fractional part for UT
JD += utHours / 24;
// 3. Calculate Greenwich Mean Sidereal Time (GMST)
// T = Julian centuries from J2000.0 (2451545.0)
var T = (JD – 2451545.0) / 36525;
// GMST at 0h UT (in degrees)
var GMST0 = 280.46061837 + 360.98564736629 * (JD – 2451545.0) + 0.000387933 * T * T – T * T * T / 38710000;
GMST0 = GMST0 % 360;
if (GMST0 < 0) GMST0 += 360;
// GMST at specific UT (in degrees)
var GMST = GMST0 + 360.98564736629 * (utHours / 24);
GMST = GMST % 360;
if (GMST < 0) GMST += 360;
// 4. Calculate Local Sidereal Time (LST)
var LST = GMST + birthLongitude;
LST = LST % 360;
if (LST < 0) LST += 360;
// Convert to radians for trigonometric functions
var LST_rad = LST * Math.PI / 180;
var latitude_rad = birthLatitude * Math.PI / 180;
// 5. Calculate Obliquity of the Ecliptic (epsilon)
// Meeus, Chapter 22
var epsilon_rad = (23.43929111 – 0.0130041667 * T – 0.0000001639 * T * T + 0.0000005036 * T * T * T) * Math.PI / 180;
// 6. Calculate Ascendant (Right Ascension of Ascendant)
// Formula: tan(Asc) = -cos(LST) / (sin(LST) * cos(epsilon) + tan(latitude) * sin(epsilon))
var ascendant_rad = Math.atan2(
-Math.cos(LST_rad),
Math.sin(LST_rad) * Math.cos(epsilon_rad) + Math.tan(latitude_rad) * Math.sin(epsilon_rad)
);
var ascendant_deg = ascendant_rad * 180 / Math.PI;
if (ascendant_deg < 0) ascendant_deg += 360;
// 7. Determine Zodiac Sign and Degree
var zodiacSigns = [
"Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo",
"Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces"
];
var signIndex = Math.floor(ascendant_deg / 30);
var degreeInSign = ascendant_deg % 30;
var risingSign = zodiacSigns[signIndex];
var degree = Math.round(degreeInSign * 100) / 100; // Round to 2 decimal places
resultDiv.innerHTML = "Your Rising Sign is:
" + risingSign + " " + degree + "°";
}
In astrology, your Rising Sign, also known as the Ascendant, is one of the three most crucial components of your birth chart, alongside your Sun and Moon signs. While your Sun sign represents your core identity and ego, and your Moon sign reflects your emotional nature and inner self, your Rising Sign dictates how you present yourself to the world, your initial reactions, and the first impression you make on others. It's essentially the "mask" you wear, the lens through which you view the world, and the way others perceive your personality.
The Rising Sign is determined by the zodiac sign that was ascending on the eastern horizon at the exact moment and location of your birth. Because the Earth rotates on its axis, a new zodiac sign rises approximately every two hours. This makes your birth time and geographical location incredibly important for an accurate calculation. Even a difference of a few minutes can sometimes shift your Rising Sign to an entirely different zodiac.
Why is the Rising Sign Important?
- First Impressions: It governs your outward personality, physical appearance, and how you come across to people you first meet.
- Life Path & Destiny: The Rising Sign sets the tone for your entire birth chart, determining the cusps of your astrological houses, which represent different areas of your life (career, relationships, family, etc.).
- Physical Manifestation: It can influence your physical characteristics, mannerisms, and even your style.
- Initial Reactions: It describes your instinctive responses to new situations and environments.
How to Use the Calculator
To accurately determine your Rising Sign, you'll need your precise birth information:
- Birth Month, Day, and Year: Your exact date of birth.
- Birth Hour and Minute (24-hour format): This is critical. If you don't know your exact birth time, you might need to consult your birth certificate or family records. Even a small error can lead to an incorrect result.
- Birth Latitude and Longitude: The geographical coordinates of your birthplace. You can often find these by searching for your birth city on a map or using an online latitude/longitude finder. For example, Los Angeles, USA, is approximately 34.05° N latitude and -118.24° W longitude.
- Time Zone Offset from UTC: This is the difference between your birth location's standard time and Coordinated Universal Time (UTC). For instance, Pacific Standard Time (PST) is UTC-8, while Central European Time (CET) is UTC+1. Be mindful of Daylight Saving Time if your birth occurred during such a period; you should use the *standard* time zone offset for your location, not the DST-adjusted one, as the calculator will handle the time conversion.
Once you input these details, the calculator performs complex astronomical calculations involving Julian dates, sidereal time, and spherical trigonometry to pinpoint the exact zodiac degree on the eastern horizon at your moment of birth.
Example Calculation:
Let's say someone was born on July 23, 1985, at 06:15 AM in London, UK.
- Birth Month: 7 (July)
- Birth Day: 23
- Birth Year: 1985
- Birth Hour (24h): 6
- Birth Minute: 15
- Birth Latitude: 51.51 (for London)
- Birth Longitude: -0.13 (for London)
- Time Zone Offset from UTC: +1 (for British Summer Time, which London was observing in July 1985. If it were standard time, it would be 0. The calculator expects the offset of the *local time* provided.)
Inputting these values into the calculator would yield their specific Rising Sign, which for this example would likely be in the sign of Leo or Cancer, depending on the precise degree.