A dasha is a period of time ruled by one graha. Vimshottari, the system used in most Indian practice, divides a 120-year cycle among the nine grahas in a fixed order and fixed lengths. Which dasha you were born into, and how much of it remained, is determined by the Moon's nakshatra at birth. Dasha is how a Vedic chart answers “when”, not “whether”.
The Vimshottari cycle
The nine mahadashas run in a fixed sequence and never vary in length. What differs between two people is where in the sequence their life starts, and how much of that first period was already spent at birth.
- Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17 — 120 years in total.
- The order is fixed and cyclical: the dasha after Mercury is Ketu again.
- The starting dasha is the lord of the janma nakshatra; the balance at birth is proportional to how far the Moon had travelled through that nakshatra.
How a dasha is read
A mahadasha is not read as good or bad on its own. What an astrologer looks at is the condition of the ruling graha in your particular chart — which houses it owns, which house it sits in, what aspects it, whether it is strong or afflicted — and then what that graha is in a position to deliver during its period.
The same Saturn mahadasha is therefore read very differently for two charts. This is the reason a general statement such as “Saturn's period is difficult” is not a reading; it is a claim about a graha with no reference to the chart it is running in.
Where dasha is actually used
Dasha is the timing layer. A yoga or a placement in the chart describes a possibility; the dasha says when that possibility is active. In practice this is what makes dasha the most consulted part of a reading — it is what turns a static diagram into a sequence of periods, and it is what a careful astrologer checks before saying a remedy is or is not currently warranted.
What is established, and what varies
These are kept apart deliberately. The first list is what published practice describes consistently; the second is where families, regions and sampradayams legitimately differ, and where a Purohit’s own tradition decides the answer rather than a general rule.
Consistently described
- Vimshottari assigns fixed period lengths totalling 120 years across the nine grahas in a fixed order.
- The birth dasha and its remaining balance are computed from the Moon's position within its nakshatra.
- Mahadashas subdivide into antardashas, and those into pratyantardashas, by the same proportional rule.
Varies by tradition
- Vimshottari is the most widely used system, but Ashtottari, Yogini and Kalachakra dashas are also used, sometimes alongside it.
- How much a reader weights dasha against transit (gochara) in timing an event differs by school.
Related service
If this applies to you, Dasha Analysis is the service that addresses it. It sits under Astrology — Personal Astrology.
Written and reviewed by the AnugrahaSidhi editorial team. Last substantive review: . How we source and correct this material is set out in our editorial policy.