Whenever planets in kendra or Angle interchange signs then this results into Maha-Parivartan Yoga. The planets in question shouldn't be at low degrees(<5°) or high degrees (>25°) (eg: Jupiter at 2.4° in the sign of gemini and mercury at 3° in sagittarius for a Virgo asc.) this will weaken the effect of Priavrtan yoga.
Besides the kendra placement, Maha-Parivartan Yoga is also applicable to houses of wealth and gain i.e. 2 and 11 respectively. If planets in these exchange the signs the native will have good gains throught their lives. Maha-Parivartan Yoga is exteremly powerful yoga which is no less than a Raja yoga.
kahal parivartan yoga occurs 3rd house lord exchanges sign placement with any other lord expect the lords of 3rd, 6th or 12th. 3rd house is considered as a uppaychya house and isn't considered a benefic house because according to Bhavat bhavam its the 8th house from the 8th. Due to this it is the 2nd most important Parivartan yoga after Maha-parivartan yoga
Dainya parivartan yoga occurs when lords of 3rd, 6th and/or 12th make parivartan yoga which any other house lords. eg: jupiter is 6th house lord and Venus is lagna lord in taurus asc. chart. When these planets exhange the signs, Dainya Parivartan yoga occurs which is considered the weakest parivartan yoga since it is exchanging signs with Dusshtanna houses.
