Moon Sign Calculator

Your moon sign is the zodiac sign the Moon occupied at your birth. The Moon governs your emotional instincts, what you need to feel safe, and how you process feeling beneath the surface. Where your Sun sign is the identity you are growing into and your rising sign is how the world first meets you, the Moon is the inner life running underneath both.

The Moon is the fastest body in the chart. It crosses the whole zodiac in about 27.3 days and spends roughly two and a half days in each sign, changing sign more than a hundred and sixty times a year. That speed is the reason your birth time can matter: born on a day the Moon switched signs, even a few hours decides which sign is yours.

To calculate your moon sign, you need three things: your date of birth, your birth time, and your birth place. Enter them into the calculator above and it casts your natal chart, then reports the zodiac sign the Moon held at that exact moment. The Moon changes sign every two to three days, which is why the time and place earn their keep.

1. Gather your birth date, time, and place. The Moon moves about 12 to 13 degrees a day, so when it changed signs on your birthday, the time decides which sign is yours.
2. Enter them into the calculator. It casts a full natal chart from JPL ephemeris data, the same source professional astrologers use, and locates the Moon to the exact degree.
3. Read your result. You get your Moon sign and its precise degree, the house the Moon falls in when your birth time is known, and a reading of your emotional style.

Prefer to do it by hand? Look up the Moon's position for your birth date in an ephemeris, the printed table of daily planetary longitudes, and convert that longitude into its zodiac sign. A calculator runs the same lookup and conversion in one step, and it handles the birth-time adjustment for the days the Moon sat near a sign boundary.

Your Sun sign is the headline everyone knows. Your Moon sign is quieter, and it often describes your day-to-day inner life more accurately. Two people born under the same Sun can need completely different things to feel safe, because their Moons differ. The Moon moves independently of the Sun, so any Sun sign can pair with any of the twelve Moon signs. That is why a Capricorn who feels nothing like the textbook Capricorn often has a watery or airy Moon doing the real emotional work.

To see the Sun, Moon, and rising together with your element balance, run the Big Three calculator, and the Sun sign vs Moon sign guide breaks the contrast down further. For the full picture of all three placements at once, read the Big Three explainer.

One quick distinction, because the words look alike. Your moon sign is which zodiac sign the Moon was in. Your moon phase is how lit the Moon was, new, full, or somewhere between, set by the angle between the Moon and the Sun. They are separate layers of the same body. Find the phase you were born under with the natal moon phase calculator, or check tonight's phase with the moon phase calculator.

Astrologers do not weigh all twelve placements the same way, and the reason is dignity. The Moon rules Cancer, so there it works on its own terms, fluent in care, memory, and belonging. It is exalted in Taurus, where steadiness and the body give feeling a calm place to rest, which the old texts read as the Moon at its most nourishing.

The harder seats sit opposite those two. The Moon is in detriment in Capricorn, the sign across from its home, where tenderness gets managed and self-sufficiency stands in for needing anyone. And it is in fall in Scorpio, where the Moon wants safety and the sign wants the unguarded truth, so feeling runs deep but rarely easy. Dignity is not a grade. A Moon in fall is not less loving; it simply works against the grain to let itself feel safe, and that effort often produces a rarer, more honest emotional depth. Your result panel names your Moon's dignity, and the essential dignities calculator weighs how much it adds or subtracts across the whole chart.

Modern astrology files the Moon under emotions. Older astrology asked it to carry much more. In Hellenistic practice the Moon stood for the body itself and the physical vitality you were handed, along with nourishment, habit, the mother, and the general course a life takes once it is set in motion. Vettius Valens returned to it on almost every page. The reasoning was physical as much as symbolic: the Moon is the closest and fastest body, so it was read as gathering the light of every planet it passed and carrying that light down to the native. Seen that way, your Moon is the channel the rest of the chart pours through.

Because it governed the body and vitality, the Moon was also a leading candidate for the hyleg, the point traditional astrologers used to judge the resilience and length of a life, especially in a night chart. You can test whether your Moon qualifies with the hyleg calculator.

Two details of the Moon's condition mattered that a sign alone will not show you. First, its light. A Moon growing brighter toward the full was read as adding and increasing, while a Moon past the full and losing light was read as releasing and winding down. Second, its speed. The Moon covers about 12 to 13 degrees a day, quicker near perigee and slower near apogee, and a swift Moon was held to bring matters on fast while a slow one drags. Neither shifts your sign. Both shape how the Moon behaves once you read the whole chart.

Traditional astrology sorts every chart into one of two groups by a single fact: whether you were born in the daytime or at night. This is sect. The Sun leads the diurnal group; the Moon leads the nocturnal one, joined by Venus and Mars. If you were born between sunset and sunrise, the Moon is the sect light, the luminary placed in charge of your chart, and its sign and condition carry extra weight in everything downstream. If you were born during the day, the Sun runs the chart and your Moon works out of sect, still meaningful but no longer the lead.

This is one reason two people with the same moon sign can live it so differently. A Cancer Moon in a night chart is at home twice over, dignified by sign and reinforced by sect. The same Cancer Moon by day keeps its tenderness with less structural backing. Sect does not overrule your sign; it sets how loud the Moon is allowed to be. It also decides which planets shelter the Moon and which press on it, since a malefic contrary to the sect of the chart is the harsher one. See which group your chart belongs to with the sect calculator, then weigh which planets help or harm your Moon with the bonification and maltreatment calculator.

The Moon also seeds the most used of the Hellenistic lots. The Lot of Fortune is built from the distance between your Sun and Moon, projected out from your Ascendant, with the direction reversing between a day chart and a night chart. That lunar root is why the old writers called Fortune the lot of the Moon, paired with the Lot of Spirit as its solar counterpart. Move the Moon and Fortune moves with it. Fortune marks the body and the material circumstances that seem to arrive unbidden, and its house became one of the anchor points of Hellenistic timing. Find yours with the Part of Fortune calculator, or read what it carries in the Lot of Fortune guide.

The placement comes from the same engine that runs every chart on Augurine, built on JPL ephemeris data, so your sign, degree, and house match a professional natal chart. The Moon moves quickly, roughly half a degree an hour, which is exactly why a precise birth time earns you the right sign on a boundary day and a reliable house every day.

From here, pair the Moon with the rest of your chart. See all of the Big Three together in the Sun, Moon, and rising calculator, or read the whole map with the free birth chart calculator. To follow your Moon in motion, track when it returns to its natal spot each month with the lunar return calculator, watch the void-of-course Moon, or map your progressed Moon as it ages through the signs.