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Vimshottari Dasha: the planetary periods

Jyotish times the events of a life with dashas (दशा), periods ruled in turn by each planet. The most used system is Vimshottari ("of 120"), named after its 120-year cycle.

The nine periods

Where the cycle starts

The first period is ruled by the lord of the birth Moon's nakshatra. Only the part of that period that remains is lived: if the Moon had covered half its nakshatra at birth, half the period is left. Example: the Moon halfway through Rohini (ruled by the Moon, 10 years) means 5 years of Moon dasha remain, followed by Mars 7, Rahu 18, Jupiter 16 and so on in the fixed order.

Sub-periods

Each mahadasha divides into nine antardashas (or bhuktis) in the same order, starting with its own lord. Each lasts (mahadasha years × antardasha years ÷ 120). In Saturn's 19-year period, the Saturn–Saturn sub-period lasts 19 × 19 ÷ 120 ≈ 3 years and Saturn–Mercury 19 × 17 ÷ 120 ≈ 2.7 years. Antardashas divide again into pratyantar dashas.

How astrologers use them

A planet is said to give its results mainly during its own periods, as shaped by its placement and strength in the birth chart. Astrologers read the running dasha together with Gochar: transits are said to bring forward what the dasha promises.

Junctions and other systems

The months around the change from one mahadasha to the next are called dasha sandhi, a junction often read as unsettled. Vimshottari is not the only scheme: Ashtottari (108 years) is used in parts of North India for some charts, Yogini dasha (a 36-year cycle of eight periods) is popular as a cross-check, and the Jaimini school uses sign-based Chara dashas. Most Indian software, and most consultations, start from Vimshottari.

A reading in practice

Someone running Jupiter mahadasha with Jupiter exalted in the 10th house would, in a traditional reading, be told to expect career growth during those sixteen years, with the timing narrowed by the antardasha and by Jupiter's and Saturn's transits. The same Jupiter period in a chart where Jupiter is debilitated in the 8th would be read very differently.

Sensitivity to the birth time

The Moon moves about 13° a day, so a birth-time error of two hours shifts the Moon by about 1° and the dasha dates by several months. Dashas are personal: they depend on the exact birth moment, not on the day's sky, which makes them a natural candidate for matching people with stocks and a harder one to test than market-wide events.

For learning and curiosity, not investment advice.