Lilith Calculator: What Is My Black Moon Lilith Sign?

What Black Moon Lilith is

Black Moon Lilith is a calculated point in the Moon's orbit, its farthest point from Earth, and not a visible body. You cannot see it in the sky, because it is a position found by calculation. In modern astrology it is read as a place where you may have felt shamed or held back, and where you can learn to express yourself more freely and without apology.

The name comes from the legendary first wife of Adam. Sepharial, an early twentieth-century astrologer, used it for a supposed second moon of the Earth, which was never confirmed. The point itself is real geometry. Only the "dark moon" story is a myth.

Mean Lilith, and why this page says so

There is more than one way to place this point. The mean Black Moon Lilith follows the Moon's average orbit and travels at an even pace. The "true" or osculating version follows the Moon's actual, changing orbit and can sit many degrees away from the mean one, jumping ahead and falling behind. Two websites can show different Lilith signs for the same person because they use different versions.

This calculator shows the mean Black Moon Lilith only. It does not show the true or osculating one, so if another site gives you a different sign, check which kind it used before you decide either one is wrong. Lilith is also the name of an asteroid and of other points in some astrologers' charts. None of those is used here.

Lilith's time in each sign

The mean point needs about 8.85 years for one trip round the zodiac, which works out at roughly nine months per sign. Over 1900 to 2100 the stay in a sign comes to between about eight and ten months. This is quick enough that two people a few months apart usually have different Lilith signs, and slow enough that a birth date almost always settles the question without the time.

A pair of real birthdays shows the cycle. Maya's birthday is 15 May 1994, and Elena's is 3 November 1985. Both have Lilith in Taurus, even though they were born about eight and a half years apart. That is the cycle at work: after roughly 8.85 years the point has come back to the same place.

Lilith and your Moon sign are different things

It is easy to mix them up. Your Moon sign is where the Moon itself stood at birth, and it describes your feelings and habits. Black Moon Lilith is the far point of the Moon's orbit, a separate position that is often in a different sign from the Moon. So you can have the Moon in one sign and Lilith in another, and the two readings address different questions: how you feel, and where you hold yourself back. If you have not looked up your Moon yet, use the Moon sign calculator and compare.

Reading your Lilith sign

Read it as a question, in the same spirit as Chiron or the North Node: where do I hold back, and what would I say or do if I stopped worrying how it looked? The meaning below the sign is a one-line summary, and the full chart adds the house. A few ways to use it:

• Notice the situations in which you edit yourself before speaking.
• Ask whether the reason is care for others or an old habit of staying quiet.
• Think of one small thing in that area that you would like to do more openly.

Lilith is not a verdict on character, and a sign that sounds fierce or private does not need to describe all of you. It describes a theme about voice and permission, and it sits beside your other placements rather than over them.

How exact the mean position is

The mean point is a smooth formula, so it is one of the easiest positions to check. We compared it with a professional reference ephemeris at more than 24,000 moments between 1900 and 2100, and none of them landed in a different sign. The largest difference was about half of one arcsecond, which is far smaller than anything a birth time could change. The full results are on the how we calculate page.

Why the sign sometimes shows twice

If Lilith crossed a border on your birthday, you see two signs listed in order. The mean position moves steadily, so this happens on roughly one date in every 270. Add your birth time in the form to settle which sign applies. If you do not have it, read both. The mean point always moves forward and never goes retrograde, so your chart will not carry a retrograde label for Lilith.

Where to read next

For the whole picture, open your birth chart with a birth time to find Lilith's house. The Chiron calculator and the North Node calculator cover the other two points that astrologers read as growth themes.