Shukra Dasha

The Venus Mahadasha is the period of Shukra in the Vimshottari dasha, and at twenty years it is the longest of the nine, the largest single share of the hundred-and-twenty-year cycle. In the fixed sequence it follows Ketu and precedes the Sun. As the great benefic of pleasure, love, art, and comfort, Venus in its dasha is traditionally read as a long season favouring relationships, marriage, wealth, beauty, and the enjoyments of life, its actual results shaped by Venus's strength and placement in the birth chart. Which dasha a person begins life in is fixed by the nakshatra of the natal Moon. These are the interpretive conventions of the tradition; the Vimshottari system is a timing method keyed to the Moon's position at birth, assigning each graha a period of set length in a set order.

The mahadasha a person is born into is rarely a fresh, full-length period: what has already elapsed of the birth nakshatra is subtracted first. Each nakshatra spans thirteen degrees twenty minutes, and the fraction of that span the Moon has already crossed at birth is applied to the ruling planet's full dasha years to find the balance remaining. A native born with the Moon exactly at the midpoint of a nakshatra ruled by Venus, for instance, begins life already halfway through the twenty-year Venus Mahadasha, with ten years remaining before Venus's own antardasha sequence finishes and the Sun's period opens. This balance-of-dasha calculation, done from the Moon's precise longitude within its nakshatra at the moment of birth, is the first and most sensitive step in casting a Vimshottari timeline, since a small error in the birth time or in the ayanamsha used can shift which planet's period, and how much of it, a chart begins under.

This period runs twenty years of the 120 that the Vimshottari cycle divides among the nine grahas, and a life enters it at birth if the Moon stood in one of its lord's three nakshatras, Bharani, Purva Phalguni and Purva Ashadha.

The order of the nine periods is fixed and does not vary: Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, and then Ketu again. It is the same order in which the nine grahas own the twenty-seven nakshatras, running three times through the list, which is what ties the dasha sequence to the Moon's position at birth. The nakshatra the Moon occupied gives the period a life begins in, and the fraction of that nakshatra already traversed gives how much of the period has already elapsed.

Each major period is subdivided in the same order and in the same proportions. A mahadasha is divided into nine antardashas, each running for the same fraction of it that its lord's own period bears to the whole 120 years, and the subdivision can be carried further into pratyantardashas and beyond. That is how the system produces timing fine enough to be tested: a combination in a chart is expected to show during the period and subperiod of the planets that form it.

At twenty years the Venus period is the longest of the nine, a full sixth of the notional 120. A person whose Moon fell in one of its three nakshatras begins life inside it, and depending on how far through that nakshatra the Moon stood, may spend the whole of childhood and youth in a single period.