The Part of Fortune is a calculated point based on the positions of the Sun, Moon, and Ascendant. It indicates the "sweet spot" in a person's life where they find the most harmony, success, and natural flow. It represents where your personality (Ascendant), emotions (Moon), and vitality (Sun) work together most efficiently.
The astronomy in these guides is computed, not copied: sign boundaries, aspect angles and planetary positions are calculated on StarBind's own servers from the same JPL planetary data NASA uses, accurate to fractions of an arcsecond.