Mithuna lagna · vimshottari
The Rahu Mahadasha for Gemini Ascendant
18 years · Rahu rules no house
The Parashari way to read a mahadasha for a given ascendant starts with the houses its lord holds. For Gemini ascendant Rahu holds none: the nodes rule no sign in whole-sign lordship, so the 18-year Rahu mahadasha for Gemini is read through the lord of the sign Rahu occupies at birth, and through that sign’s house from Gemini, which no table can supply without the chart.
Rahu is exalted on the commoner reckoning in Taurus, the 12th from Gemini, and debilitated by the same reckoning in Scorpio, the 6th; planets.js records other signs as well. Rahu counts Mercury, Gemini’s lagna lord, a friend; Mercury’s own row names no node, so the reverse has no entry. Rahu’s own nakshatras fall in Ardra (the 1st), Swati (the 5th) and Shatabhisha (the 9th) for Gemini ascendant, which is where a birth that opens in the Rahu mahadasha has its Moon.
The Nine Sub-Periods, by Lordship for Gemini
| # | Antardasha | Length (classical) | Its lord rules, for Gemini |
|---|---|---|---|
| 1 | Rahu–Rahu | 2 years 8 months 12 days | no house |
| 2 | Rahu–Jupiter | 2 years 4 months 24 days | the 7th and the 10th |
| 3 | Rahu–Saturn | 2 years 10 months 6 days | the 8th and the 9th |
| 4 | Rahu–Mercury | 2 years 6 months 18 days | the 1st and the 4th |
| 5 | Rahu–Ketu | 1 year 18 days | no house |
| 6 | Rahu–Venus | 3 years | the 5th and the 12th |
| 7 | Rahu–Sun | 10 months 24 days | the 3rd |
| 8 | Rahu–Moon | 1 year 6 months | the 2nd |
| 9 | Rahu–Mars | 1 year 18 days | the 6th and the 11th |
For Gemini ascendant, three of the Rahu mahadasha’s sub-periods belong to lords of a dusthana (the 6th, 8th or 12th): Rahu–Saturn, Rahu–Venus and Rahu–Mars, and two to lords of a trikona other than the 1st: Rahu–Saturn and Rahu–Venus. The sub-period of Mercury, Gemini’s lagna lord, is Rahu–Mercury, the fourth of nine, 2 years 6 months 18 days long. Counted in time, sub-periods whose lords hold a dusthana for Gemini take 6 years 10 months 24 days (38%) of the Rahu mahadasha’s 18 years, and those whose lords hold a trikona other than the 1st take 5 years 10 months 6 days (32%); a lord holding both is counted in both. In the Rahu mahadasha for Gemini, the Rahu and Ketu sub-periods are read through their dispositors in the chart, since neither node rules a house.
For a Gemini-rising chart this is the frame of the Rahu mahadasha, not a forecast: where Rahu and each sub-period lord actually sit, and their dignity there, decide what it comes to, and this page cannot know either.
Related
For Gemini or any other ascendant, the Rahu mahadasha’s sub-period arithmetic, with the nine pratyantars of each, is on the Rahu mahadasha table; the Gemini chart house by house on the Gemini ascendant page. How the Rahu mahadasha is read in general is in our Rahu mahadasha article, and the system in Vimshottari dasha explained.