ॐVedic astrology · 5 min
The Vimshottari dasha is the most widespread timing system in Vedic astrology. The word "vimshottari" means roughly "one hundred and twenty": according to tradition the full human life cycle is 120 years, and this is divided into nine planetary periods. The system starts from the Moon's nakshatra, so the Moon's position at birth is decisive.
The nine planets and their periods
The order of the planets and the length of the major periods (mahadasha) in years:
- Ketu: 7
- Venus: 20
- Sun: 6
- Moon: 10
- Mars: 7
- Rahu: 18
- Jupiter: 16
- Saturn: 19
- Mercury: 17
The total is exactly 7 + 20 + 6 + 10 + 7 + 18 + 16 + 19 + 17 = 120 years. The order is fixed and repeats cyclically.
Where does the calculation start?
The same nine planets rule the 27 nakshatras, in an order repeated three times: Ashwini (Ketu), Bharani (Venus), Krittika (Sun), Rohini (Moon), Mrigashira (Mars), Ardra (Rahu), Punarvasu (Jupiter), Pushya (Saturn), Ashlesha (Mercury), then Ketu again, and so on. At birth the ruler of the Moon's nakshatra gives the first mahadasha. Since the Moon may be anywhere within the nakshatra, only the remaining part of that period is running at birth.
Example: the Moon stands at 16°40′ sidereal Taurus, which is the middle of the Rohini nakshatra (10°00′ to 23°20′ Taurus), so it has already crossed half of the nakshatra. Rohini's ruler is the Moon, so 5 years remain of the Moon's 10. Then: Mars (7) from age 5 to 12, Rahu (18) 12 to 30, Jupiter (16) 30 to 46, Saturn (19) 46 to 65, and so on.
Sub-periods: antardasha
Within each mahadasha the same nine planets recur as sub-periods (antardasha or bhukti), in the same order, starting with the ruler of the mahadasha. The length of a sub-period is (years of the major period × years of the sub-period) / 120. For example, the Jupiter–Saturn sub-period: 16 × 19 / 120 ≈ 2.53 years, about 2 years 6.4 months. It can be refined further into pratyantardasha and still smaller levels.
How tradition reads it
According to tradition, the ruler of the period "colours" that stretch of time according to its position in the birth chart (its sign, house and aspects). If, for example, the ruler of the period also rules the 10th house, the period may bring career themes to the fore. Transits are usually examined together with the dasha. The traditional interpretation rests on a great many variables, which is why readings can differ enormously.
Other dasha systems
Other systems are used alongside the Vimshottari: for example the Yogini dasha (a 36-year cycle), the Ashtottari dasha (108 years) or Jaimini's Chara dasha, which is based on the order of the signs. Different systems give different timings for the same person, which shows how interpretation-dependent the method is.
Scientific status
The predictive power of the dasha system has not been confirmed by controlled studies; "successful" predictions often rest on after-the-fact fitting and the Barnum effect. The planetary periods are long (6 to 20 years) and something is always happening in a life, so a reading can almost always be confirmed in hindsight. It is safer to use the system as a symbolic calendar: not a prophecy, but one possible frame for self-reflection.
If you want to try it, calculate your own dashas and write down a few turning points from your past. See how closely the period changes coincide with them, and how much overlap chance alone would produce.