Hi Harald - I'm not sure I totally understand your question. The Graphic Ephemeris in the Cosmobiology module is constructed by noting the position of the natal planets in the Cardinal/Fixed/Mutable sort (C/F/M). So, referring to the screenshots below, Boris Johnson's natal Sun-Venus conjunction is around 28.5 degrees of Gemini (a mutable sign). These appear in the 90 degree dial around 88.5 degrees (near the cardinal axis - slightly to the right). When these are transferred to the Graphic Ephemeris they appear near the bottom of the graph, at 44.25 or so. In the 45-degree sort (dividing the horoscope wheel by
shown in the Ephemeris, these degrees correspond to 88.5 degrees in the wheel.
Johnson's nodal axis is at 2 degrees of Cancer, which is 2 degrees of cardinals in the dial. You can find this just to the left of the cardinal axis. If you look at the top right hand corner of the Ephemeris at 2 degrees you will find the nodal symbol and it's corresponding horizontal line. Since Jupiter and Neptune are in the middle of fixed signs, which correspond to the beginning of cardinal signs in the 45-degree sort, you will see that his Jupiter-Neptune conjunction is close to the nodal axis, representing the semi-square (45 degrees) between Jupiter in Taurus and the north node, and the seqsuiquadrate (135 degrees) between Neptune and the north node.
The whole constellation translates as AR=SO/NN=VE/NN=ME/AS=JU/NE. You can translate this for yourself I'm sure, but my reading is that this midpoint picture tells a lot about Johnson's ability to charm people and use language to tell people what they like to hear.