Continuing my research, please see
attached a pair of charts that correlate the positions of the four gas giants (notation: Jupiter, Saturn, Uranus, Neptune = JSUN) and the position of the solar system barycentre (SSB) over the period 1882-2061. This period is typical for the 179 year JSN cycle. Planetary periods are shown in actual temporal relation, but with equal radius for greater ease of interpretation. The sine waves are a 2D representation of orbits mapped onto a cylinder. All inferior conjunctions are marked, eg JS, SN, etc.
The following observations are of interest.
1. SSB maxima generally coincide with JS inferior conjunctions, and SSB minima generally coincide with JS superior conjunctions (as noted by Newton).
2. Deviations from this pattern are explained by the influence of Neptune and Uranus. For example,
- the long maximum at 1896-1903 correlates to the JN, SU and JU conjunctions preceding the JS conjunction;
- the greatest minimum at 1990 matches J opposite SUN;
- the 1919, 1958, 1998 and 2037 maxima precede JS due to JN and/or JU; and
- the 1943, 1982 and 2022 maxima follow JS due to JN and/or JU.
3. The wiggles in the graph are where J conjuncts U and N in between the JS cycle, at 1970 and at present.
Robert Tulip