Carl, thanks, I have not seen a graph of planetary solar latitudes before, just looking at vertical rather than horizontal cycles. It is interesting to see the erratic SSB latitude movements in 1950 and 1992. I hope you and Ray won't mind if I ask some dumb questions about the Y axis. When planets are at the top of the curve does this mean they are at the point on their orbit where their solar latitude is greatest, ie northern point vis-a-vis solar system ecliptic plane? And vice versa is the bottom of the curve when planets are at southmost point of their orbit? Are the inflection points the nodes of each planetary orbit? Do the four gas giants all have the same amplitude of solar latitude or are the data harmonised to put them on the same scale?