Note: I have updated and added files to some of the older pages above.
I have finally reached a point in my research where most of the Astro section diagrams have been found to concern a specific time and place: 07 December 1486, near the center of Aries (astrologically 07Taurus). The diagram of f68r3 is the centerpiece.
I have added a new page above with a flowchart showing my interpretaions and how they are related, then a sky map with the collected diagrams.
I do not know, yet, what is so significant about this spot, and research is continuing.