The Nodal Periods do not rule houses so they are judged according to their natures and by reference to the houses they are in natally. The North Node period is good, being of the nature of Venus and Jupiter, and the South Node period usually entails letting go of things, renunciation and loss, since it is of the nature of Mars and Saturn). Thus, in the example Figure the North Node's 3 years are good for consulting, communicating, teaching and writing. While the South Nodes 2 years are bad for temporal concerns and good for spiritual disciplines requiring renunciation and letting go of identifications.So, there we have the Firdaria Technique. Essentially, what it does is to give to each planet a specific period of time during which it will manifest whatever it promises in the natal figure. One way of using it is to find the planet which is promising something you are interested in and see when its Period and sub-periods are in effect. At these times you may expect the manifestation of the thing you are interested in.