The use of midpoints is an astrological method for helping anyone find chart strengths and weaknesses. Midpoints were also used before and during the Middle Ages, although one form of midpoints became more popularly known as 'Arabic Parts' during those times, and that name carries to this day.
Planetary pictures are a form of midpoints activating midpoints.
Arabic Parts and planetary pictures each use a method of looking for the interaction of either three or four planets or points in a chart. An astute astrologer would quickly note that this particular formula is saying that the Part of Fortune for a day birth is conjunct Jupiter. It is all the same thing, it is just how you care to label this information. The Solar Arc is the difference in degrees and minutes between the natal Sun and the secondary progressed Sun. In Germany in the 1930s, certain members of the Ebertin family, starting with Elsbeth Ebertin and then Reinhold Ebertin, tried to work with the Hamburg School, but had certain sharp disagreements with them.