The North Node isn't a physical body — it's one of two points where the Moon's orbit crosses the ecliptic (the Sun's apparent path), and it marks a direction of growth rather than a fixed trait. Where the personal planets describe who someone already is, the North Node describes who they're being asked to become: often an unfamiliar, effortful direction rather than a natural strength.
This app computes the mean node (the smoothly averaged position, the standard default used by most software and most published reference charts) rather than the more erratic true node, which oscillates around the mean position by a couple of degrees.
The North Node always sits exactly opposite the South Node — they're two ends of the same axis, not two separate placements.