An antardasha, or bhukti, is a sub-period inside a mahadasha. Each mahadasha is divided among all nine grahas in the same fixed order, proportionally to their own dasha lengths. The antardasha is what explains why a long period is not uniform — why a sixteen-year Jupiter mahadasha contains stretches that feel nothing alike.

How the sub-periods are divided

The division is arithmetic, not interpretive. Within any mahadasha, the share of each antardasha is the ruling graha's own Vimshottari length as a fraction of 120, applied to the mahadasha's length. The first antardasha of a mahadasha is always ruled by the mahadasha lord itself, and the rest follow in the standard order.

So a Saturn mahadasha of 19 years opens with a Saturn–Saturn antardasha of about 3 years, and later contains a Saturn–Mercury antardasha of about 2 years 8 months. The same subdivision repeats one level down as pratyantardasha, and further still if a reading needs that resolution.

Why the sub-period often matters more than the period

A reading that only names the mahadasha is describing a decade or two in one word. The antardasha is where a specific window comes from. Practitioners read the pair together: what the mahadasha lord is able to give in this chart, filtered through what the antardasha lord is able to give, and whether the two grahas are friendly, in mutual aspect, or own houses that conflict.

This is also why “my Saturn period started and nothing happened” is a common and reasonable observation. The mahadasha sets the theme; the antardasha, and the transits running across it, decide when anything becomes visible.

Reading a dasha table

A printed or software dasha table lists start and end dates for each level. Two cautions are worth knowing before you read one. The dates are computed from your birth time, so an unrectified birth time shifts every row. And the boundaries are not switches — practitioners generally treat the transition between periods as a span of weeks, not a date on which one thing ends and another begins.

What is established, and what varies

These are kept apart deliberately. The first list is what published practice describes consistently; the second is where families, regions and sampradayams legitimately differ, and where a Purohit’s own tradition decides the answer rather than a general rule.

Consistently described

  • Antardashas divide a mahadasha among all nine grahas proportionally to their Vimshottari lengths, beginning with the mahadasha lord.
  • The subdivision continues to pratyantardasha and finer levels by the same rule.
  • Every dasha and antardasha date depends on the birth time, because the starting balance does.

Varies by tradition

  • How finely a reader subdivides — whether pratyantardasha is consulted routinely or only for a specific question — is a matter of practice.
  • Whether period boundaries are treated as sharp or as overlapping transitions differs by school.

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