How a Kundli Changes: Vimshottari, Not Progression

Mars in the 7th remains Mars in the 7th at age forty. What turns on is the mahadasha. The sequence is Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17, totaling 120. At birth only the leftover fraction of the Moon-star's lord is pending. After that, the periods follow in order. A person born with the Moon in Bharani starts in Venus, because Bharani's lord is Venus, and then meets the Sun. A person with the Moon in Ardra starts in Rahu. Same lagna, different decades.

Inside a mahadasha, antardashas run through the same nine lords, starting with the mahadasha lord. The length is the product of the two year-numbers, divided by 120. Saturn-Saturn is a little over three years at the opening of Saturn's 19. A career change, a marriage, or a move is usually this smaller hand, not a new rising sign. Gochar, especially Saturn and Jupiter, is the weather inside the hand you are already holding. Saturn's transit does not rebuild the lagna.

Western secondary progressions move the chart forward by about a day for each year of life, so the progressed Sun changes sign a few times in a life. Jyothish SI does not time events that way. The sidereal natal chart is cast once, with Lahiri and Swiss Ephemeris, from time and city. Divisional charts such as Navamsa are slices of that same moment, not later years. If you want the evolution, name the mahadasha and the antardasha. If a program offers a progressed ascendant, it is answering a question this kundli does not ask.