The North Node is one of two points where the Moon's orbit crosses the ecliptic. It represents the direction of growth, new skills to be learned, and the individual's future path. It indicates qualities you need to develop to achieve balance.
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.