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Moon Sign Calculator

Calculate the Moon's tropical sign and degree for a birth instant. An unknown time is kept visible as uncertainty, especially when the Moon changes signs that day.

Astronomical positions are calculated; astrology and numerology interpretations are symbolic, not scientifically validated assessments.

Birth details

Reference cities use centre coordinates. Edit them for your actual birthplace. Historical offsets follow your browser’s time-zone database; check your record when clocks changed.

Calculations stay in your browser. We do not put birth details in URLs, storage or analytics. Results are not sent to a server.

Enter your details and choose Calculate. Examples are illustrative, not saved profiles.

How this calculation works

Astronomy Engine calculates geocentric lunar position; its ecliptic longitude determines the tropical sign and degree.

Assumptions and limits

The Moon moves much faster through the zodiac than the Sun. A noon example is not a confirmed birth placement if the actual time is unknown.

Questions about moon sign

Can the Moon change sign during one day?

Yes. Two people born on the same civil date can have different Moon signs.

Is Moon sign the same as Moon phase?

No. A sign is a longitude sector; phase describes the Moon's illumination and geometry relative to the Sun.

Useful next steps