Here you can download transit lists of the synodic cycles - the cycles between a pair of outer planets, for Jupiter, Saturn, Uranus, Neptune and Pluto. Each list details the date aspects between the planets are perfected (exact); the zodiacal degree of each planet, if either planet is in direct or retrograde motion. I use the following aspects for this work: conjunction, opposition, trine, square, sextile, semisquare, sesquiquadrate, semisextile, quincunx; and also watch the parallel and contra-parallel positions.  If a particular configuration looked alarming, I'd look closer and shift to different forecasting techniques. The lists range over multiple centuries to view the synodic cycle repeating.

I recommend students cross-reference and correlate the changing phases/aspects of the synodic cycles with a chronology of historical events in our collective development. If you build your knowledge of how we have manifest energies previously under a variety of astrological conditions, you will gain insight into our collective psyche and developmental journey. This improves your ability to anticipate our responses to given astrological conditions, to then forecast our potential future, based on past results. Research reveals that similar events occur, when similar astrological themes repeat. I've found it more productive to research our collective development than individual development, because collectively we are far more predictable. As individuals we do have free will, and we exist within a collective destined to evolve as the sum of its parts :)     

The variables in the astrological system are considerable. A conjunction of Neptune and Pluto in Aries indicates the beginning of a different developmental theme, than if the conjunction occurred in Aquarius. The themes persist from conjunction to conjunction. Browse the Neptune Pluto synodic cycle and note the long length of the cycle and its phases.  Note its conjunctions maintaining a Gemini theme over centuries.  Interpret in context via the longest to shortest cycle lengths; then synthesise all synod themes for options of energy manifestations.

Feel welcome to email your questions on synodic cycles and answers will be compiled on a corresponding FAQ page.    

The dates and times provided are in UT (Universal Time), on base coordinates at Greenwich, UK. 
If you want to convert times to suit your time zone, here's a link to a Time & Date website.

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