Parivartana yoga (sign exchange)
Parivartana yoga forms when two planets sit in each other’s signs, such as Mars in Taurus and Venus in Aries. The exchange links their houses closely, as if each planet stood in its own sign.
Also known as: Parivartan yoga, Mutual exchange, Sign exchange yoga, Parivartana yog, exchange of houses
Parivartana means exchange. When planet A occupies a sign ruled by planet B, and B occupies a sign ruled by A, the two are bound together at least as strongly as by a conjunction. Each acts partly as if it were at home, and the affairs of the houses they rule become intertwined.
Phaladeepika sorts exchanges into three kinds. Maha yoga is an exchange between lords of good houses (1, 2, 4, 5, 7, 9, 10, 11). Dainya yoga involves the lord of the 6th, 8th or 12th, and Khala yoga the lord of the 3rd. Maha yogas are prized; the other two give more mixed results.
An exchange between the 9th and 10th lords, for example, is a powerful Raj yoga. An exchange between the 1st and 8th lords ties the self to change and uncertainty: not bad in itself, but it calls for careful reading.
Exchanges can also be read in the Navamsa and other divisional charts. As with any yoga, the results show most in the dashas of the two planets.