Vimshottari Dasha Balance Calculator
This calculator helps determine the balance of your initial Vimshottari Dasha period at birth, a crucial element in Vedic astrology for understanding life's planetary influences. The calculation is based on the precise longitude of the Moon at the moment of your birth.
Understanding Vimshottari Dasha and Its Balance
In Vedic astrology, the Vimshottari Dasha system is a powerful predictive tool that outlines the planetary periods (Dashas) influencing an individual's life. This system is based on the position of the Moon at the time of birth, specifically which of the 27 Nakshatras (lunar mansions) it occupies.
What is Vimshottari Dasha?
The Vimshottari Dasha system divides a person's life into a cycle of 120 years, ruled sequentially by nine planets: Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, and Mercury. Each planet rules a specific number of years:
- Ketu: 7 years
- Venus: 20 years
- Sun: 6 years
- Moon: 10 years
- Mars: 7 years
- Rahu: 18 years
- Jupiter: 16 years
- Saturn: 19 years
- Mercury: 17 years
The sequence of these Dashas is fixed, always following the order listed above. After Mercury Dasha, the cycle repeats starting with Ketu.
The Balance of Dasha at Birth
The first Dasha period a person experiences at birth is determined by the Nakshatra in which their Moon is placed. Each Nakshatra is associated with a specific planetary ruler. For example, if your Moon is in Ashwini Nakshatra, your first Dasha will be Ketu Dasha.
The "balance of Dasha" refers to the remaining duration of this initial planetary period at the exact moment of birth. Since the Moon might be at any point within a 13-degree 20-minute Nakshatra, only a fraction of the ruling planet's total Dasha period will be left to experience. The portion of the Nakshatra already traversed by the Moon determines how much of the Dasha has already passed, and the remaining portion determines the balance.
How is it Calculated?
The calculation involves these steps:
- Identify the Moon's Nakshatra: Based on the Moon's precise longitude (0-360 degrees), the calculator determines which of the 27 Nakshatras it falls into.
- Determine the Nakshatra Lord and Period: Each Nakshatra has a specific ruling planet and a corresponding Dasha period (e.g., Ketu for Ashwini, 7 years).
- Calculate Traversed Portion: The Moon's position within that specific Nakshatra (how many degrees and minutes it has moved from the Nakshatra's start point) is used to find the proportion of the Nakshatra already traversed.
- Calculate Balance: This proportion is then applied to the total Dasha period of the ruling planet to find out how much of the Dasha has already passed. The remaining duration is the "balance of Dasha" at birth.
Why is it Important?
The balance of Dasha at birth signifies the planetary period that is active from the moment you are born. This initial Dasha sets the tone for your early life experiences and influences your personality, circumstances, and major life events during that period. Understanding this balance is fundamental for any deeper astrological analysis and prediction.
Example Calculation:
Let's say your Moon's Longitude at Birth is 15 degrees Aries.
- Nakshatra Identification: 15 degrees Aries falls within the Bharani Nakshatra, which spans from 13°20′ Aries to 26°40′ Aries.
- Nakshatra Lord and Period: Bharani Nakshatra is ruled by Venus, and its total Dasha period is 20 years.
- Moon's Position within Nakshatra: The Moon is 15°00′ Aries. The start of Bharani is 13°20′ Aries. So, the Moon has traversed 1°40′ (1.6667 degrees) within Bharani.
- Fraction Traversed: Each Nakshatra is 13°20′ (13.3333 degrees) long. The fraction traversed is 1.6667 / 13.3333 = 0.125.
- Dasha Period Passed: 0.125 * 20 years (Venus Dasha) = 2.5 years.
- Balance of Dasha: 20 years – 2.5 years = 17.5 years.
So, in this example, the balance of Venus Dasha at birth would be 17 years, 6 months, and 0 days.
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function calculateDashaBalance() {
var moonLongitudeInput = document.getElementById("moonLongitude");
var resultDiv = document.getElementById("result");
var moonLongitude = parseFloat(moonLongitudeInput.value);
if (isNaN(moonLongitude) || moonLongitude 360) {
resultDiv.innerHTML = "Please enter a valid Moon's Longitude between 0 and 360 degrees.";
resultDiv.className = "calculator-result error";
return;
}
var nakshatras = [
{ name: "Ashwini", lord: "Ketu", period: 7, startDegree: 0 },
{ name: "Bharani", lord: "Venus", period: 20, startDegree: 13.333333 },
{ name: "Krittika", lord: "Sun", period: 6, startDegree: 26.666667 },
{ name: "Rohini", lord: "Moon", period: 10, startDegree: 40.000000 },
{ name: "Mrigashira", lord: "Mars", period: 7, startDegree: 53.333333 },
{ name: "Ardra", lord: "Rahu", period: 18, startDegree: 66.666667 },
{ name: "Punarvasu", lord: "Jupiter", period: 16, startDegree: 80.000000 },
{ name: "Pushya", lord: "Saturn", period: 19, startDegree: 93.333333 },
{ name: "Ashlesha", lord: "Mercury", period: 17, startDegree: 106.666667 },
{ name: "Magha", lord: "Ketu", period: 7, startDegree: 120.000000 },
{ name: "Purva Phalguni", lord: "Venus", period: 20, startDegree: 133.333333 },
{ name: "Uttara Phalguni", lord: "Sun", period: 6, startDegree: 146.666667 },
{ name: "Hasta", lord: "Moon", period: 10, startDegree: 160.000000 },
{ name: "Chitra", lord: "Mars", period: 7, startDegree: 173.333333 },
{ name: "Swati", lord: "Rahu", period: 18, startDegree: 186.666667 },
{ name: "Vishakha", lord: "Jupiter", period: 16, startDegree: 200.000000 },
{ name: "Anuradha", lord: "Saturn", period: 19, startDegree: 213.333333 },
{ name: "Jyeshta", lord: "Mercury", period: 17, startDegree: 226.666667 },
{ name: "Moola", lord: "Ketu", period: 7, startDegree: 240.000000 },
{ name: "Purva Ashadha", lord: "Venus", period: 20, startDegree: 253.333333 },
{ name: "Uttara Ashadha", lord: "Sun", period: 6, startDegree: 266.666667 },
{ name: "Shravana", lord: "Moon", period: 10, startDegree: 280.000000 },
{ name: "Dhanishta", lord: "Mars", period: 7, startDegree: 293.333333 },
{ name: "Shatabhisha", lord: "Rahu", period: 18, startDegree: 306.666667 },
{ name: "Purva Bhadrapada", lord: "Jupiter", period: 16, startDegree: 320.000000 },
{ name: "Uttara Bhadrapada", lord: "Saturn", period: 19, startDegree: 333.333333 },
{ name: "Revati", lord: "Mercury", period: 17, startDegree: 346.666667 }
];
var nakshatraLength = 13.3333333333; // 13 degrees 20 minutes
var currentNakshatra = null;
var degreeWithinNakshatra = 0;
for (var i = 0; i = nak.startDegree && moonLongitude < nextNakStart) {
currentNakshatra = nak;
degreeWithinNakshatra = moonLongitude – nak.startDegree;
break;
}
}
// Handle the edge case where moonLongitude is exactly 360 (Revati end)
if (moonLongitude === 360) {
currentNakshatra = nakshatras[nakshatras.length – 1]; // Revati
degreeWithinNakshatra = nakshatraLength; // Moon is at the very end
}
if (!currentNakshatra) {
resultDiv.innerHTML = "Could not determine Nakshatra for the given longitude. Please check the input.";
resultDiv.className = "calculator-result error";
return;
}
var fractionTraversed = degreeWithinNakshatra / nakshatraLength;
var dashaPeriodPassed = fractionTraversed * currentNakshatra.period;
var balanceDashaYears = currentNakshatra.period – dashaPeriodPassed;
// Convert balance to years, months, days
var years = Math.floor(balanceDashaYears);
var remainingYearsFraction = balanceDashaYears – years;
var months = Math.floor(remainingYearsFraction * 12);
var remainingMonthsFraction = (remainingYearsFraction * 12) – months;
var days = Math.round(remainingMonthsFraction * 30.4375); // Average days in a month
// Adjust for 30 days in a month for simplicity in display
if (days === 31) { // If rounding makes it 31, carry over to month
days = 0;
months++;
}
if (months === 12) { // If months become 12, carry over to year
months = 0;
years++;
}
resultDiv.innerHTML = "Your Birth Nakshatra is
" + currentNakshatra.name + "." +
"The ruling planet for your initial Dasha is
" + currentNakshatra.lord + "." +
"The balance of
" + currentNakshatra.lord + " Dasha at birth is
" +
years + " years, " + months + " months, and " + days + " days.";
resultDiv.className = "calculator-result";
}