Moon sign calculator
Enter your birth date and city. A birth time is optional: if the Moon changed signs on your birthday, you will see the time it switched.
How this calculator works
With a birth time, the calculator returns the Moon's tropical sign at that minute. Without one, it checks the Moon's position across your whole birth date in your local time zone and finds any sign change to within a minute.
Positions come from Astronomy Engine (VSOP87 and ELP-2000), the same code that drives the birth chart calculator. For what each placement means, open the sign in your result.
Questions
- Can I find my Moon sign without my birth time?
- Usually, yes. The Moon spends about two and a half days in each sign, so on most dates it stays in one sign from midnight to midnight and the answer does not depend on the hour. When the Moon does change sign on your birth date, this calculator shows the local time of the change and the sign before and after it, so you only need to know whether you were born before or after that time.
- How fast does the Moon move through the zodiac?
- About 12 to 15 degrees a day, or roughly one degree every two hours. It goes around the whole zodiac in about 27.3 days, which is why the Moon is the placement most often changed by a missing birth time.
- Why does the calculator ask for a city?
- The Moon is in the same sign everywhere on Earth at a given instant. The city only sets your time zone, which decides when your birth date started and ended, and so which stretch of the Moon's path belongs to your birthday.
- Is this the Western or the Vedic Moon sign?
- Western (tropical). Vedic astrology uses the sidereal zodiac, which currently sits about 24 degrees behind the tropical one, so a Vedic Moon sign is often one sign earlier. The sidereal chart calculator on this site gives that version.
- Is my birth data saved anywhere?
- No. The sign is computed by JavaScript in your browser and nothing is sent to a server. The page link keeps your date and place so you can come back to the result, so share that link only with people you would tell your birthday to.
Reference, not advice
This is cultural and astronomical reference, not personal prediction or advice.
This calculator is a reference tool. Astrology is documented cultural and historical material; it is not a scientifically demonstrated method of prediction. See the disclaimer.
Last reviewed .