Mahadasha and Antardasha: How Vedic Astrology Times Events
In short
The Vimshottari dasha is a 120 year cycle divided among the nine grahas. The lord of the nakshatra the Moon occupied at birth rules the first mahadasha, and each mahadasha contains antardashas running in the same fixed order.
A birth chart shows what is possible. The dasha system shows when. Without it, astrology can describe a life but cannot time anything, which is why the Vimshottari dasha is treated as one of the great achievements of the Indian tradition.
The cycle runs for 120 years and is divided among the nine grahas in a fixed order: Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19 and Mercury 17. Those numbers total 120.
Where a person enters that cycle is determined by the Moon. Whichever nakshatra the Moon occupied at birth, its ruling planet governs the first mahadasha. The portion of that nakshatra the Moon had already crossed is the portion of the dasha already spent, so the first period a person lives through is usually a partial one.
Within each mahadasha the same nine planets run again in the same order as antardashas, proportioned to their own lengths. Within each antardasha there is a further subdivision, the pratyantardasha, used for finer timing.
Reading a dasha is not a matter of labelling planets good or bad. What matters is which houses the planet rules in that particular chart, how strong it is, and which houses it occupies. Saturn is feared in general conversation, yet a Saturn period is often the most productive stretch in a chart where Saturn rules well.
This is also why a chart can contain a powerful Raja Yoga that never seems to arrive. If the planets forming that yoga do not run their period during the person's lifetime, the promise stays dormant. Knowing which years are yours is the most practical thing astrology offers.
Frequently asked questions
What is the dasha calculated from?+
From the Moon’s nakshatra position at birth. However far the Moon had already travelled through that nakshatra is how much of the first mahadasha has already elapsed.
Is the dasha of a malefic always bad?+
No. The result depends on which houses the planet rules, how strong it is, and where it sits. A Saturn or Rahu period can be highly productive when they are well placed.
When does a yoga in the chart actually deliver?+
When the planets forming it run their mahadasha or antardasha. This is why a chart can contain a strong Raja Yoga that never visibly fires.
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