Moon Sign Calculator

Tropical lunar position

Find your Moon sign

Use an exact local birth time, the historical UTC offset, and birthplace coordinates to place the Moon on the tropical zodiac.

12 tropical sectors
Geocentric primary
0.1° boundary check

Moon position

Geocentric label first, with the observer view kept separate.

0° Aries starts at the top · 12 fixed 30° sectors · no houses

Example result · Entered coordinates

Moon in Scorpio13.3186° within Scorpio

2000-01-01 · 12:00 local · UTC+00:00

Outside the 0.1° boundary-review band

Primary longitude223.3186°Geocentric tropical position

Calculated UTC2000-01-01T12:00:00ZFrom local time + entered offset

Moon–Earth distance402444.81 kmApproximate geocentric distance

Primary · geocentricScorpio223.3186° longitude

Location audit · topocentricScorpio222.601° longitude

Western tropical astrology · symbolic lens

Scorpio Moon interpretation

A fixed cultural reference matched to the calculated geocentric sign—not an output of the astronomical formula.

Water element
Fixed modality
Traditional dispositor: Mars
Traditional condition: Fall

Emotional themes

Privacy and trust
Depth and intensity
Endurance in close bonds

Constructive expression

Commitment
Emotional honesty
Staying with complexity

Possible tensions

All-or-nothing reactions
Testing trust
Holding injuries too tightly

Timing context

Transit reference points—not a luck forecast

In traditional astrology, a lunar return is the transiting Moon’s 0° conjunction to the natal Moon, roughly every 27.3 days. It is a periodic activation, not inherently favourable. Trines and sextiles are commonly read as easier-flowing contacts; no aspect guarantees an event or outcome.

0° conjunction · lunar returnScorpio 13.3186°

120° trine targetsPisces 13.3186° / Cancer 13.3186°

60° sextile targetsVirgo 13.3186° / Capricorn 13.3186°

These are zodiac-degree targets, not dates or promises. Exact applying, exact, and separating times require a transit ephemeris and a disclosed orb; life-area forecasting also requires the full natal chart and houses.

This reading uses the symbolic framework of Western tropical astrology. It is not a scientifically validated personality assessment or event prediction, and should not guide consequential decisions. Dignity and debility describe traditional planetary conditions—not a person’s worth or a “good/bad” score.

Reference terms: Moon and dignity/debility · aspects and orbs · lunar periods · evidence boundary

Astronomical details

Geocentric latitude: 5.1712°
Topocentric longitude: 222.601°
Method: Meeus chapter 47 mean geocentric series; separate sea-level topocentric parallax audit
Formula version: 1.0.0

Convert local civil input with the entered historical offset.2000-01-01 12:00 UTC+0 = 2000-01-01T12:00:00Z
Evaluate the unrounded 60-term lunar series.λ = 223.31861273075°, β = 5.1712381591238°, Δ = 402444.81238724 km
Divide normalized longitude into twelve conventional 30° sectors.223.31861273075° → Scorpio 13.318612730754°
Apply observer parallax at the entered coordinates.0°, 0°E → λtopo 222.6010222053°

The longitude is an approximate astronomical coordinate. Any interpretation shown below is a fixed summary of a cultural tradition, not evidence about personality or future events.
The primary label uses the conventional geocentric longitude. The topocentric result is shown separately to audit parallax and does not silently replace the geocentric convention.
The result uses the historical UTC offset you entered. Recheck daylight-saving and historical timezone rules if that offset is uncertain.
This engineering preview is pending independent ephemeris review and is not an official JPL, USNO, or Meeus implementation.

Lunar coordinate and parallax guide

A Moon-sign result begins with the correct instant and reference point

The Moon moves quickly enough that a date, a clock reading, a historical UTC offset, and the choice between Earth-centered and observer-centered longitude all deserve to remain visible. This calculator treats the tropical label as the final mapping step, not as a personality verdict.

Step-by-step guide · Lunar coordinate and parallax guide

The geocentric series is the primary lunar calculation

Primary convention: Geocentric tropical longitude
Observer audit: Separate sea-level topocentric result
Boundary threshold: High-precision review within 0.1°

Convert UTC to Julian date
Astronomical series use a continuous time argument. The entered civil instant is therefore converted to Julian date before angular arguments are evaluated.
Evaluate the longitude, latitude, and distance terms
The implementation uses the complete 60-term longitude/distance table and the corresponding latitude terms in the declared Meeus method. It returns geocentric longitude, latitude, and Earth–Moon distance instead of discarding the underlying coordinate work after naming a sector.
Normalize and divide the ecliptic longitude
Longitude is wrapped onto a 0°–360° circle and divided into twelve cultural sectors of 30°. The quotient selects the tropical label; the remainder is the number of degrees within it.

A Moon-sign result begins with the correct instant and reference point: The method follows the periodic lunar-position framework documented in Jean Meeus's Astronomical Algorithms and retains full intermediate precision until display.

Resolve the birth instant before calculating the Moon

The workbench begins with local civil date and time plus an explicitly verified historical UTC offset. It does not look up a city, infer daylight saving, or decide which side of an ambiguous clock change the record meant. After applying the entered offset, it displays the resulting UTC instant. That visible conversion is essential because a plausible but wrong offset can produce a mathematically consistent answer for the wrong moment.

If your source already gives a properly converted UTC time and you want the Sun and Saturn alongside the Moon, use the limited natal-position summary. If you only know a calendar date, the date-only Sun-sign calculator makes a disclosed noon convention; it cannot safely be repurposed to locate the much faster-moving Moon.

The geocentric series is the primary lunar calculation

The method follows the periodic lunar-position framework documented in Jean Meeus's Astronomical Algorithms and retains full intermediate precision until display.

Convert UTC to Julian date
Astronomical series use a continuous time argument. The entered civil instant is therefore converted to Julian date before angular arguments are evaluated.
Evaluate the longitude, latitude, and distance terms
The implementation uses the complete 60-term longitude/distance table and the corresponding latitude terms in the declared Meeus method. It returns geocentric longitude, latitude, and Earth–Moon distance instead of discarding the underlying coordinate work after naming a sector.
Normalize and divide the ecliptic longitude
Longitude is wrapped onto a 0°–360° circle and divided into twelve cultural sectors of 30°. The quotient selects the tropical label; the remainder is the number of degrees within it.

Earth center and surface observer answer different coordinate questions

The result presents both frames because parallax is a real geometric effect, not because it offers two competing character readings.

Geocentric longitude

This direction is measured as though the observer were at Earth's center and supplies the primary tropical label under the calculator's stated convention. Many astrology tables use a geocentric framework for the Moon.

Topocentric longitude

This audit applies parallax for the entered geodetic latitude, east-positive longitude, and a sea-level observer. It can differ visibly because the Moon is close enough for observer position to change apparent direction.

A label disagreement

When the two longitudes straddle a 30-degree edge, the page reports both rather than choosing silently. First decide which coordinate convention the intended reference uses; then compare a precision ephemeris if the distinction matters.

Near a sector edge, add evidence rather than decimals

A geocentric longitude within 0.1 degree of a tropical boundary triggers review. That threshold is a product safeguard, not an uncertainty distribution. A longer decimal printed by the same approximation would not resolve model truncation, time-offset error, or a frame mismatch. Reproduce the exact UTC instant in JPL Horizons or another independently maintained high-precision ephemeris and compare like with like.

The Saturn return calculator illustrates the same principle at a different timescale: lower-accuracy planetary elements are useful for locating broad review windows, but they do not justify an exact event date. For the Moon, the rapid apparent motion makes clean input provenance especially important even when the underlying series is carefully implemented.

Do not turn a coordinate label into a human assessment

The astronomy is bounded and testable; the familiar astrological meanings belong to a cultural framework and have a different evidentiary status.

The result does not infer emotional needs, attachment style, compatibility, fertility, mental health, or likely events. None of those claims follows from lunar longitude.
A tropical Moon sector is not the same object as an IAU constellation. Equal 30-degree divisions and officially bounded sky regions answer different classification questions.
Use the three-body natal summary only when you need its disclosed Sun–Moon–Saturn coordinate table; it also intentionally omits a complete chart and interpretation.
Treat any traditional reading as optional cultural material, never as grounds for medical, legal, financial, relationship, educational, or safety decisions.

Important limitations

Moon Sign Calculator is limited to the finite inputs, modes, and outputs stated for the Moon sign from an explicit UTC instant method. Check birth date, birth time, UTC offset at birth, birth latitude, and birth longitude, validation messages, the equation, and the stated display precision before relying on geocentric tropical label, degrees within label, geocentric longitude, and geocentric latitude.

This formula passed its registered engineering tests and is published under an explicit site-owner policy authorization. No independent expert, QA, editorial, legal, or third-party review is claimed. Verify consequential results with a qualified professional.

Lunar coordinate and parallax guide

A Moon-sign result begins with the correct instant and reference point

Step-by-step guide · Lunar coordinate and parallax guide

The geocentric series is the primary lunar calculation

Primary convention: Geocentric tropical longitude
Observer audit: Separate sea-level topocentric result
Boundary threshold: High-precision review within 0.1°

Convert UTC to Julian date
Astronomical series use a continuous time argument. The entered civil instant is therefore converted to Julian date before angular arguments are evaluated.
Evaluate the longitude, latitude, and distance terms
The implementation uses the complete 60-term longitude/distance table and the corresponding latitude terms in the declared Meeus method. It returns geocentric longitude, latitude, and Earth–Moon distance instead of discarding the underlying coordinate work after naming a sector.
Normalize and divide the ecliptic longitude
Longitude is wrapped onto a 0°–360° circle and divided into twelve cultural sectors of 30°. The quotient selects the tropical label; the remainder is the number of degrees within it.

Resolve the birth instant before calculating the Moon

The geocentric series is the primary lunar calculation

The method follows the periodic lunar-position framework documented in Jean Meeus's Astronomical Algorithms and retains full intermediate precision until display.

Convert UTC to Julian date
Astronomical series use a continuous time argument. The entered civil instant is therefore converted to Julian date before angular arguments are evaluated.
Evaluate the longitude, latitude, and distance terms
The implementation uses the complete 60-term longitude/distance table and the corresponding latitude terms in the declared Meeus method. It returns geocentric longitude, latitude, and Earth–Moon distance instead of discarding the underlying coordinate work after naming a sector.
Normalize and divide the ecliptic longitude
Longitude is wrapped onto a 0°–360° circle and divided into twelve cultural sectors of 30°. The quotient selects the tropical label; the remainder is the number of degrees within it.

Earth center and surface observer answer different coordinate questions

The result presents both frames because parallax is a real geometric effect, not because it offers two competing character readings.

Geocentric longitude

Topocentric longitude

A label disagreement

Near a sector edge, add evidence rather than decimals

Do not turn a coordinate label into a human assessment

The astronomy is bounded and testable; the familiar astrological meanings belong to a cultural framework and have a different evidentiary status.

The result does not infer emotional needs, attachment style, compatibility, fertility, mental health, or likely events. None of those claims follows from lunar longitude.
A tropical Moon sector is not the same object as an IAU constellation. Equal 30-degree divisions and officially bounded sky regions answer different classification questions.
Use the three-body natal summary only when you need its disclosed Sun–Moon–Saturn coordinate table; it also intentionally omits a complete chart and interpretation.
Treat any traditional reading as optional cultural material, never as grounds for medical, legal, financial, relationship, educational, or safety decisions.

Moon Sign Calculator

Find your Moon sign

Birth moment

Moon position

Scorpio Moon interpretation

Transit reference points—not a luck forecast

A Moon-sign result begins with the correct instant and reference point

The geocentric series is the primary lunar calculation

Convert UTC to Julian date

Evaluate the longitude, latitude, and distance terms

Normalize and divide the ecliptic longitude

Resolve the birth instant before calculating the Moon

The geocentric series is the primary lunar calculation

Earth center and surface observer answer different coordinate questions

Geocentric longitude

Topocentric longitude

A label disagreement

Near a sector edge, add evidence rather than decimals

Do not turn a coordinate label into a human assessment

Important limitations

Find your Moon sign

Birth moment

Moon position

Scorpio Moon interpretation

Transit reference points—not a luck forecast

A Moon-sign result begins with the correct instant and reference point

The geocentric series is the primary lunar calculation

Convert UTC to Julian date

Evaluate the longitude, latitude, and distance terms

Normalize and divide the ecliptic longitude

Resolve the birth instant before calculating the Moon

The geocentric series is the primary lunar calculation

Earth center and surface observer answer different coordinate questions

Geocentric longitude

Topocentric longitude

A label disagreement

Near a sector edge, add evidence rather than decimals

Do not turn a coordinate label into a human assessment