Thanks. Looking again at the SSB minus Jupiter, you can see the line starts and ends in the middle where the loop is not exact. I would be interested to know the period of this graph. Assuming it primarily shows the Saturn-Neptune opposition as marking the points where the SSB is closest to the sun and the Saturn-Neptune conjunctions as the points where SSB is furthers from the Sun, at 35.8 years per cycle the graph seems to show 107.4 years of the SSB. Is this right?