The Dasha You Are Born Into

The twenty-seven nakshatras cycle through nine lords: Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, and then the cycle repeats. Ashwini is Ketu, Bharani is Venus, Krittika is the Sun, Rohini is the Moon. A Moon in Rohini opens a Moon mahadasha, whose full length is 10 years. A Moon in Ardra, Rahu's star, opens Rahu, whose full length is 18. If the Moon has already crossed most of the star, most of those years are already spent and the balance is short. The fraction is the untraversed part of the star. No degree is invented here. The ephemeris measures it.

The first years of life are whatever balance remains, then the next lord in order. After Rahu comes Jupiter, 16 years. After Saturn comes Mercury, 17. A person who meets Jupiter mahadasha in childhood is not luckier by type than a person who meets Saturn. They are in the lord their Moon selected, and that lord acts through the houses it rules and occupies. A Saturn birth dasha for Libra lagna is a yogakaraka's opening, because Saturn owns the 4th and 5th. The same opening for a lagna where Saturn owns the 8th is heavier. The lord's job in that chart shapes the early house.

Once the balance ends, the queue is fixed. You can know the order without knowing the dates, and you need the Moon's position to know the dates. The birth dasha shapes life because it spends the childhood houses: often the 4th of home and mother, the lagna of the body, the 2nd of family. Later mahadashas spend marriage and career if their lords rule the 7th and 10th. A progressed chart is not required. The natal Moon already started the clock. Jyothish SI computes the balance from the sidereal Moon, Lahiri, once the birth city has set the zone offset.