Black Moon Lilith isn't a body either — it's the point marking the far end of the Moon's elliptical orbit around Earth (the lunar apogee), the moment the Moon is furthest away and most "itself," unpulled by Earth's gravity. Astrologically it's read as the place in the chart holding what's raw, instinctual, and unashamed — desire, anger, sexuality, independence — especially whatever a person was taught early on to soften, hide, or apologize for.
Where it sits by sign and house points to where that reclamation work shows up: not a flaw to fix, but a suppressed authenticity worth letting back in.
This app computes the mean Lilith (the smoothly averaged apogee position), which precesses forward through the zodiac in a steady ~8.85-year cycle — the standard default most software and reference charts use, as opposed to the more erratic true or osculating Lilith some traditions also track.