The most discussed and mysterious column within the Babylonian astronomy is column phi. It is closely connected to the lunar velocity and to the duration of the Saros. This paper presents new ideas for the development and interpretation of column phi. It combines the excellent Goal-Year method (for the prediction of Lunar Six time intervals) with old ideas and practices from the "schematic astronomy". Inspired by the old "TU11" rule for prediction of times of lunar eclipses, it proposes that column phi, in a similar way, used the sum of the Lunar Four to predict times of lunar eclipses as well as the duration of one, 6, and 12 months by means of what usually is called "R-S" schemes. It also explains fully the structure and development of such schemes, a fact that strongly supports the new interpretation of column phi.