You've been trying to work out correspondences between the phases of Vivid's moon and some of the less-studied astrological influences that have potential for agriculture. These other notes are about how to identify areas that have a high number of "facets," a term angels can't usefully explain but that seems to correspond with higher fertility, animals behaving strangely, and occasionally buried treasure.
The thing is that in order to get anyone to actually use your arcane knowledge you have to figure out what signs someone can read if they don't have access to a source interpreter. It turns out that agronomancy is about one part astrology, one part natural philosophy, and five parts explaining things to people who don't care that much.