8.3% of the 120-year cycle, divided into nine antardashas. Every length here is 10 × B / 120 — arithmetic, not opinion.
Moon Mahadasha runs for 10 years, which is 8.3% of the 120-year cycle. It follows Sun Mahadasha (6 years) and is followed by Mars Mahadasha (7 years). Because the cycle is 120 years long and a life is not, most people meet it once or not at all — when it arrives depends entirely on where in the sequence you were born.
You are born into it if the Moon was in Rohini, Hasta, Shravana — the three nakshatras Moon rules.
Every mahadasha is divided into nine sub-periods in the same order, starting with its own lord. An antardasha of B inside Moon runs for 10 × B / 120 years — so the longest here is Moon–Venus and the shortest is Moon–Sun. The nine add to 3,652 days, which is the mahadasha’s own rounded length — they divide it with nothing left over and nothing borrowed.
| Antardasha | Length | In days |
|---|---|---|
| Moon–Moon | 10m 0d | 304 days |
| Moon–Mars | 7m 0d | 213 days |
| Moon–Rahu | 1y 6m 0d | 548 days |
| Moon–Jupiter | 1y 4m 0d | 487 days |
| Moon–Saturn | 1y 7m 0d | 578 days |
| Moon–Mercury | 1y 5m 0d | 517 days |
| Moon–Ketu | 7m 0d | 213 days |
| Moon–Venus | 1y 8m 0d | 609 days |
| Moon–Sun | 6m 0d | 183 days |
A DASHA YEAR HERE IS 365.25 DAYS, which is what the chart engine uses. It is the common modern convention and it is not the only one — software set to a 360-day savana year makes this mahadasha 3,600 days instead of 3,652, a difference of 52. So these figures match a panchang using the same year length, and will differ from one that does not. The ratio between the nine sub-periods is the same either way.
Classical jyotisha associates Moon with the mother, the mind, home, and how settled a person feels. That is the tradition’s reading and it is offered as such: everything above this line is arithmetic, and this line is not. What a period does in a particular life depends on where Moon actually sits in that chart — which house it rules, which it occupies, and what aspects it. A page cannot know that; a chart can.
10 years, which is 8.3% of the 120-year Vimshottari cycle. It is divided into nine antardashas, the longest being Moon–Venus.
It runs from birth if the Moon was in Rohini, Hasta, Shravana — the nakshatras Moon rules. Otherwise it arrives in sequence after Sun Mahadasha, and whether it arrives in your lifetime depends on where in the cycle you were born.
Nine, in the fixed order starting with Moon itself. Each runs for 10 x its own dasha years / 120 — for example Moon–Moon is 0y 10m 0d. The nine together come to exactly 10 years.
It follows from the Moon’s nakshatra at your birth. Cast the chart free and the whole 120-year timeline comes with it.