Free Astrology Calculator
Moon Sign Calculator
Your Moon sign is the zodiac sign the Moon was in when you were born. It describes your emotional needs, your instincts and what helps you feel at home. The Moon changes sign every two to two and a half days, so add your birth time and place for a certain answer.
What Your Moon Sign Describes
The Moon describes the inner life: moods, needs, habits, memory and the ways you look after yourself and others. Where the Sun is the self you grow into, the Moon is the self you come home to. Two people with the same Sun sign can feel very different to know because their Moons differ. Read more about the Moon in astrology.
How the Moon Sign Is Calculated
The Moon is the fastest body in the chart. It moves about 13 degrees a day, crosses a whole sign in about 2.3 days and circles the zodiac in about 27.3 days. In one day it can move from late in one sign into the next, which is why so many birth dates have two possible Moon signs.
The calculator places the Moon with the ELP lunar theory, corrected for light time and aberration, at your exact birth instant. Without a birth time it checks every hour of the day you were born.
Why Birth Time Matters
Between 1950 and 2050, the Moon changed sign on about 44% of days, roughly 1 day in 2. If your birthday is one of them, the sign depends on the hour you were born. Without a time, the calculator checks every hour of your birth date (in every time zone, if you leave out the place) and shows each sign the Moon could have held.
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.
How Often the Moon Changes Sign
Counted from the Moon's sign changes between 1950 and 2050.
- Average stay per sign
- 2.3 days
- Longest single stay
- 2.5 days in Capricorn
- Days with a sign change
- About 1 in 2 (43.9%)
- Sign changes counted
- 16,201, 1950 to 2050
The Moon by Birth Year
Every day of a year, with the sign and degree of each planet, in the daily ephemeris.
- 1950s
- 1950195119521953195419551956195719581959
- 1960s
- 1960196119621963196419651966196719681969
- 1970s
- 1970197119721973197419751976197719781979
- 1980s
- 1980198119821983198419851986198719881989
- 1990s
- 1990199119921993199419951996199719981999
- 2000s
- 2000200120022003200420052006200720082009
- 2010s
- 2010201120122013201420152016201720182019
- 2020s
- 2020202120222023202420252026202720282029
Moon Sign Questions
How Do I Find My Moon Sign?
Enter your birth date, time and place in the calculator above. The Moon's sign comes from its position at your birth instant. Because the Moon changes sign every two to two and a half days, your birth time decides the answer on many dates.
Can I Find My Moon Sign Without a Birth Time?
Usually. The Moon changed sign on about 44% of days between 1950 and 2050, roughly 1 day in 2. On those days the calculator shows both possible signs until you add your birth time and place.
What Is the Difference Between a Sun Sign and a Moon Sign?
The Sun sign describes identity and purpose, the person you are becoming. The Moon sign describes emotional needs and instincts, what you reach for when you are tired or upset. Many people recognize themselves more in their Moon sign than in their Sun sign.
Why Do Other Moon Sign Calculators Give a Different Answer?
Usually because of the birth time or time zone. A calculator that ignores daylight saving, or assumes noon, can land on the wrong side of a sign change. This one applies your birthplace's historical time zone rules and tells you when your date has two possible signs.
What Does the House of My Moon Mean?
The sign describes how the Moon works; the house describes where in life it works: home, work, relationships, friendships and so on. Houses need your birth time and place, because they turn with the Earth once a day. Add both and the calculator gives the house in Placidus or Whole Sign houses.