Black Moon Lilith Calculator

What Your Lilith Sign Describes

Black Moon Lilith describes raw instinct and the parts of yourself you may have learned to hide: desires that were judged, anger that was not allowed, a wildness that does not ask permission. Its sign shows the style of that refusal, and its house shows where in life it lives. Read more about Black Moon Lilith.

How the Lilith Sign Is Calculated

Black Moon Lilith is not a body. It is the lunar apogee, the far end of the Moon's elliptical orbit. The calculator uses mean Lilith, the smoothed position most astrologers mean by "Black Moon Lilith". It moves forward through the zodiac in about 8.85 years, spending about 9 months in each sign, and never turns retrograde.

Some software also offers a true or osculating Lilith, which swings up to about 30 degrees either side of the mean point. Results that use it can name a different sign, so check which one a source is using.

Why Birth Time Matters

Lilith changes sign on only about 1 day in 271. For almost every birthday the date alone gives the sign, and the birth time adds the exact degree and the house. If Lilith changed sign on your birth date, the calculator shows both signs and tells you so.

With your birth time and place, the result also gives the exact degree and the house, the area of life where this placement works.

How Accurate Is It?

Positions come from Selfgazer's astrology engine, the same one that draws the chart in your astro room: VSOP87 planetary theory through Astronomy Engine, with Chiron from Swiss Ephemeris tables. Tested against the Swiss Ephemeris, planets agree to within half an arcminute and house cusps to within a tenth of an arcminute. Your local birth time is converted with your birthplace's historical time zone rules, including past daylight saving changes. Everything is calculated in your browser, and nothing you enter is stored.