Mars Sign Calculator

Your Moon sign is the zodiac sign containing the Moon’s geocentric ecliptic longitude at your birth. In astrology, it is used as a symbol for emotional habits and a sense of safety. It is different from your Sun sign.

Often, yes. Enter your date and birthplace and choose “I don’t know my birth time.” We calculate the full local day. If the Moon changes signs, we show both possibilities, the transition time and each sign’s share of the day. Those percentages are time coverage, not a personal probability or personality score.

Your birthplace supplies a historical timezone and coordinates. The timezone turns the clock time on your birth record into UTC. Coordinates are needed for the Rising sign; Moon and planet signs use geocentric positions.

This site uses the Western tropical zodiac: twelve equal 30-degree signs measured from the equinox. Sidereal and Vedic calculations use a different reference and may give another sign. We do not currently offer a sidereal calculation.

We use Astronomy Engine for astronomical positions and Luxon with the browser’s IANA timezone data. Astronomy Engine targets approximately one arcminute accuracy; this is a library target, not a guarantee for every birth record. Rounded times and incomplete historical timezone records can matter near a sign change.

Calculations run in your browser. Birth inputs are remembered only on this device when you enable “Remember on this device.” Place searches reach our server. Sharing is optional and sends only the signs and lunar phase you choose to share, never your birth date, time or birthplace.

Yes. The Ascendant depends on your exact time and location. We leave it blank when your time is unknown instead of inventing a result. A few minutes can matter near a Rising-sign boundary.

Astronomical positions can be calculated, but astrological personality and relationship interpretations are not established scientific predictions. Use this site for entertainment and personal reflection, not medical, financial or other professional decisions.