Longitudinal distance of the HSB PFSS on the days they were predicted to be at central meridian by the HSB-Earth method, for the days RHESSI observed flares. For Cycle 23, 89% of HSB PFSS with polarity change (−, +) were no further than 30° away from central meridian, while the percentage for the HSB PFSS (+, −) was 68%. For Cycle 24 68% of HSB PFSS (−, +) were within 30° of central meridian, with 66% for HSB PFSS (+, −).