In solar arcs, both Pluto and Saturn have the distinction of being difficult taskmasters, with the potential for rather painful destructive periods.
In narrowing down a possible outcome for solar arcs between the two planets arcing to each other's natal positions, do you say "planet x, ruler of x house, arcing to planet y, ruler of y house, is applying x house energy to planet y" or do the two houses combine energy?
Here's the case: two years prior, a client is involved in a car accident, which injures his back (already weakened by scoliosis). In this instance, Solar arc Saturn is in the first (natally and during the arc), ruling third house, arcing to Pluto (natally in twelfth), ruler of first house. Third house ruling cars, first house ruling the body, Pluto's natal position in the twelfth representing an undermining of physical health.
The question is, does an approaching Solar arc of Pluto to Saturn suggest more of the same, as SA Pluto is traveling through the first house? Another back-wrecking car accident?
Do we read this as: the first example is the third house incident happens to the first house ruler - a car will injure the body - and in the second upcoming example, the first house incident happens to the third house ruler - the person/body/personality will work hard at third house matters? It may be important to note this native works as a computer programmer (third house reference) and several projects have a possibility of coming due simultaneously.
If different houses are used, say twelfth and second, it's easy to see that the twelfth house ruler arcing to the second house would be potentially devastating to the native's finances and personal belongings. But what if the second house ruler is arcing to the twelfth house ruler? Is it the same?
Robert