Antardasha (bhukti) explained: how sub-periods are calculated

What is an antardasha (bhukti)?

In the Vimshottari system, each Mahadasha is a major chapter ruled by one planet. Antardasha means inner period. Each Mahadasha is split into nine antardashas, one for each planet. Bhukti is another word for the same thing.

So a statement like Venus Mahadasha, Mercury Antardasha means you are in the Venus chapter, in its Mercury sub-period.

The order rule

The antardashas of any Mahadasha start with the Mahadasha planet itself. After that they follow the fixed Vimshottari sequence, continuing in a loop: Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury.

For example, in a Venus Mahadasha the first sub-period is Venus-Venus. The sequence then runs Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury and finally Ketu, which wraps around from the start of the list.

The formula

Each antardasha is proportional to that planet's own Mahadasha years. The formula is:

Antardasha length = Mahadasha years × Antardasha planet years / 120

The planet years are Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19 and Mercury 17. They add up to 120, so the nine antardashas always add up to the Mahadasha length.

Worked example: Venus Mahadasha (20 years)

Here is the formula applied to the 20-year Venus Mahadasha. Each length is 20 × (planet years) / 120. The last column is rounded to months, and the total is exactly 20 years.

A shortcut worth knowing

When the Mahadasha is 20 years, the length in months of each antardasha is simply the planet's years × 2. The same arithmetic works for any Mahadasha. See the Saturn version in the Saturn Mahadasha guide.

Pratyantardasha: the next level down

The division does not stop there. Each antardasha is split again into nine pratyantardashas, using the same order and the same proportional rule. There are still finer layers beyond that. Most readers use the Mahadasha and Antardasha pair, and look at the finer levels only for timing detail.

How to read Mahadasha and Antardasha together

A common method is to treat the Mahadasha as the main theme and the antardasha as the flavour. The Mahadasha planet sets the broad subject for several years. The antardasha planet adds a focus or colour for a shorter stretch.

For each of the two planets the tradition looks at its house, sign, dignity, the houses it rules for your ascendant, and its relationship with the other planet. If they are friendly or placed well in relation to each other, the combination is classically read as smoother. If not, it is read as more mixed. These are tendencies, not predictions.

• ✦Mahadasha: the main subject of the era
• ✦Antardasha: the sub-theme or flavour right now
• ✦Relationship between the two planets in your chart
• ✦Transits running at the same time, such as Sade Sati

Why birth time matters for transition dates

Every antardasha date traces back to one number: your Moon's exact position at birth. The Moon moves about 13 degrees a day, so a few minutes of difference in birth time shifts the starting point a little, and the dates of every later change move with it. With a few hours of error, the shift can be months.

If a transition date is close to a date you care about, it is worth checking your birth time. See how to find your nakshatra for the starting point.

See yours

Working these dates by hand is easy to get wrong. MoonMapped's free reading shows your current Mahadasha and Antardasha with the date each ends, calculated from your birth details using the Lahiri ayanamsa.