Amrutkaal Vimshottari Dasha — The 120-Year Planetary Period Cycle
The Vimshottari Dasha (विंशोत्तरी दशा) is the most widely used predictive timing system in Vedic astrology (ज्योतिष) — a sequence of planetary periods that maps which graha (ग्रह, planet) governs each stretch of your life. Its name comes from the Sanskrit for one hundred and twenty (विंशोत्तर शत), because the full cycle of all nine periods spans exactly 120 years, taken as the ideal human lifespan. Unlike Western transit techniques, Vimshottari is keyed not to the Sun but to the Moon — specifically to the nakshatra (नक्षत्र, lunar mansion) the Moon occupied at the moment of birth. Each of the nine planetary rulers — the seven classical grahas plus the lunar nodes Rahu and Ketu — owns a fixed block of years, and they always run in the same order. The system divides time hierarchically — a long Mahadasha (महादशा) is subdivided into Antardashas (अन्तर्दशा), and those into still finer periods — so that two influences are always active at once. Because the cycle is anchored to a precise point in the zodiac, your starting period and its remaining balance depend entirely on an accurate birth time. Our free kundli computes the full dasha timeline automatically from your birth details.
The Nine Periods and Their Lengths
Vimshottari assigns each of the nine grahas a fixed number of years, and they always proceed in a set order — Ketu (केतु) 7, Venus (शुक्र) 20, Sun (सूर्य) 6, Moon (चन्द्र) 10, Mars (मंगल) 7, Rahu (राहु) 18, Jupiter (गुरु) 16, Saturn (शनि) 19, and Mercury (बुध) 17. Adding these gives 7 + 20 + 6 + 10 + 7 + 18 + 16 + 19 + 17 = 120 years, the length of one complete cycle.
After Mercury's period concludes, the sequence loops back to Ketu and begins again — though few live to see a second full rotation. The order is fixed and never varies; what differs from person to person is only the planet you start with and how much of that first period remains at birth.
Mahadasha, Antardasha and the Hierarchy of Time
The top-level period ruled by a single graha is the Mahadasha (महादशा), or major period. Within each Mahadasha the same nine planets recur as sub-periods called Antardashas (अन्तर्दशा), also known as bhuktis (भुक्ति). The length of each Antardasha is proportional to its ruler's share of the 120-year cycle — so within a 16-year Jupiter Mahadasha, the Saturn bhukti is longer than the Sun bhukti, scaled by their 19-year and 6-year weights.
Tradition reads the active combination together — the Mahadasha lord sets the broad theme while the Antardasha lord colours the specific results, judged by each planet's strength, ownership and placement in the birth chart. Finer subdivisions (pratyantardasha and beyond) narrow the timing further for those who want precision.
Finding Your Starting Dasha from the Moon's Nakshatra
The starting Mahadasha is read from the nakshatra (नक्षत्र) occupied by the Moon at birth. Each of the 27 nakshatras is assigned a ruling planet that repeats every nine — Ketu rules Ashwini, Magha and Mula; Venus rules Bharani, Purva Phalguni and Purva Ashadha; and so on through the cycle. The lord of your birth nakshatra is the lord of your first Mahadasha.
You are rarely born at the exact start of a nakshatra, so the first period is almost always partial. The unspent balance is found from how far the Moon has progressed through its nakshatra — if the Moon has crossed, say, 40 percent of a nakshatra ruled by the Moon (a 10-year period), then 6 years remain. This is why an exact birth time matters — even a small error shifts the Moon's longitude and rebalances the entire timeline.
Frequently Asked Questions
Why does the Vimshottari cycle add up to 120 years?
The nine planetary periods — Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19 and Mercury 17 — sum to exactly 120 years, the span tradition takes as the ideal full human lifespan. After the last period the cycle repeats from the beginning.
What is the difference between a Mahadasha and an Antardasha?
A Mahadasha (महादशा) is the major period ruled by one planet, lasting up to 20 years. Each Mahadasha is divided into nine Antardashas (अन्तर्दशा), or bhuktis — sub-periods ruled by all nine planets in turn, proportional to their share of the 120-year cycle. Two influences are always active at once.
How is the starting dasha determined?
It is set by the nakshatra (नक्षत्र) the Moon occupied at birth, since each nakshatra has a ruling planet. That planet rules your first Mahadasha, and the balance remaining at birth depends on how far the Moon had travelled through the nakshatra — which is why an accurate birth time is essential.