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Natal Moon Phase Calculator

Enter your birth date to find the Moon phase you were born under, from New Moon to Waning Crescent. It is worked out from the real positions of the Sun and Moon in your browser.

The phase changes slowly, so your birth date is enough to name it. A birth time only matters if you were born close to the moment the Moon crossed into the next phase, where it sharpens the result.

How this works. Your natal Moon phase is calculated from real astronomy (the same engine used inside the Alya app). We compute the angle between the Sun and the Moon at your birth, then read the illuminated fraction and name the phase from that angle. The phase is the same everywhere on Earth, so no birth place is needed. Your details stay in your browser and are used only to work out those two positions.

For entertainment and reflection. Astrology is a symbolic tradition, not a science. The phase and its illumination are grounded in real positions of the Sun and Moon, but the personality reading is interpretive and is not medical, psychological, legal or financial advice.