What is Vimshottari Dasha?

Vimshottari Dasha is the most widely used Indian system of planetary periods: a cycle of 120 years divided among the nine grahas, each ruling a stretch of life in a fixed order. Which period a person is born into — and how much of it is left — follows directly from the Moon’s position at birth.

The 120-year cycle

Nine lords hold fixed period lengths in years: Ketu 7, Shukra 20, Surya 6, Chandra 10, Mangala 7, Rahu 18, Guru 16, Shani 19, Budha 17. They sum to 120 — vimshottari means “one hundred and twenty” — and always run in that order, wrapping round to Ketu.

How the starting point is fixed

Each of the 27 nakshatras is assigned one of the nine lords, the sequence repeating three times around the zodiac. The lord of the nakshatra the Moon occupied at birth rules the first mahadasha. Because the Moon is normally part-way through that nakshatra already, only the unelapsed fraction remains: if the Moon has crossed a quarter of a Guru nakshatra, the balance is three quarters of 16 years. That remainder is the dasha bhogya a chart prints.

Mahadasha, antardasha and below

Each mahadasha subdivides into nine antardashas in the same lord order, proportioned by the same 120-year ratios, and those subdivide again into pratyantardasha and further. The arithmetic is exact; a conventional 360-day “dasha year” is used, which is why almanac dasha balances are quoted in years, months and days.

What it is and is not

The dasha sequence is a deterministic calculation from a single number — the Moon’s longitude. Nothing in it requires interpretation, and nothing in it supplies one. What a period is said to signify belongs to the reading of a chart, not to its computation.

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