The changes between the Lot of Spirit and the Lot of Fortune are only for predictive techniques, one cannot use the the LoF as an alternative LoS or the other way round. The LoSpirit  has purely to do with the motivating impulse to act or do something whereas the LoFortune  has purely to do with those things that come back to us as a result of our actions.

 

However, the diurnal and nocturnal formulas are not very well understood and do cause the miscalculation of these two lots, in this respect the LoFort.  & the LoSpirit, can take each others place and cause a delineation mistake.