Moon Phase at Birth Calculator
See the Moon's phase and illuminated fraction at a birth instant. The graphic follows the calculated phase; the astronomical result is kept separate from symbolic interpretation.
Astronomical positions are calculated; astrology and numerology interpretations are symbolic, not scientifically validated assessments.
Enter your details and choose Calculate. Examples are illustrative, not saved profiles.
How this calculation works
Phase angle is the geocentric Moon–Sun ecliptic separation. Illuminated fraction is calculated separately from the Sun–Moon–Earth geometry, not inferred from the phase name.
Assumptions and limits
The graphic is a simplified north-up phase diagram, not a photograph or a simulation of local tilt. A phase name groups a range of angles; illumination changes continuously.
Questions about moon phase at birth
Does waxing mean more of the Moon is lit?
Waxing means the phase is progressing from new toward full. Waning progresses from full toward new.
Does being born at a full Moon determine my personality?
No scientific personality conclusion follows from a lunar phase. Symbolic readings are cultural interpretations.