Private astrology calculator

Calculate your Moon sign

Your birth details

Enter your birth details

The birth city sets your local time zone.

Birth place

City search runs on your device. Your search is not sent.

Set the place manually

Coordinates are optional here. A recognized IANA time zone (for example Europe/Warsaw) is enough to apply the correct historical offset, but the rising sign and houses need latitude and longitude too.

Birth date
Birth time

Pick a city to apply its time zone

Loading chart tools…

Calculated in your browser. Saving birth details to an account is optional.

Ready when you are.

Your Moon sign is the zodiac sign the Moon occupied at the minute you were born; pick your birth city and time and it is calculated here, offline.

Read more

Moon in AriesMoon in TaurusMoon in GeminiMoon in CancerMoon in LeoMoon in VirgoMoon in LibraMoon in ScorpioMoon in SagittariusMoon in CapricornMoon in AquariusMoon in Pisces

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Direct answer

What you need

Birth details are never placed in the URL or sent for calculation. They stay in this browser, which remembers them for next time unless you choose Don’t remember; Keep this chart saves them to an account only if you press it.

Method & limits

Astronomy first, symbolism second.

Calculations use the tropical zodiac and geocentric apparent ecliptic positions. A rising sign cannot be calculated responsibly without an exact time and place; near a sign boundary, a small input error can change the result.

In short

Computes
The sign and degree the Moon held at your birth, and its phase.
You enter
Birth date, time and city.
You get
Moon sign, degree and birth phase; with no time, both signs if the Moon changed sign that day.
Accuracy
Well under a degree; the Moon moves about thirteen degrees a day, so the time matters most.

Checked

Frequently asked questions

How accurate is this Moon sign calculator?

The Moon's position comes from Astronomy Engine, computed to well under a degree of precision for the date and time you enter. Because the Moon moves roughly thirteen degrees a day, the main source of error is an uncertain birth time, not the calculation itself.

What happens if I do not know my exact birth time?

Leaving the birth time unknown checks whether the Moon changed sign at any point during that calendar day in your birthplace's zone. If it did, both signs are shown along with the changeover time, so you can see whether you need the exact hour to know which one applies to you.

What is a cusp Moon, and how is it different from a cusp Sun sign?

A cusp Moon is a birth date where the Moon crosses into a new sign sometime that day, which happens roughly twelve times a month since the Moon moves so quickly. This is far more common than a cusp Sun sign, which happens only twice a year, which is why an exact time matters more for the Moon than for almost any other placement.

Does this use the tropical or sidereal zodiac?

This calculator uses the tropical zodiac, the seasonal system most Western astrology is built on, where zero degrees Aries marks the spring equinox point rather than a fixed star. The sidereal zodiac, anchored to the visible constellations, would place the Moon in a different sign for some birth dates.

Why do I need to enter a birthplace for a Moon sign?

The birthplace sets the historical time zone for your birth date, which converts your entered local time into the correct astronomical instant before the Moon's position is calculated. Skipping it falls back to your device's current time zone, which is only correct if you were born in the same zone you are using this page from. For a birth before 1970 in a small set of zones — mostly the Low Countries, Scandinavia and the former Yugoslavia — the historical rules come from the tzdata backzone (release 2025c), compiled into the site.

Is my birth information sent anywhere?

No. The calculation runs entirely in your browser using a local astronomy library and an offline city list; birth details are not sent for calculation or placed in the URL. This browser remembers them on this device for next time unless you choose Don’t remember, and Forget removes them. If you choose Keep this chart, its birth details are saved to your optional account until you delete them.