Charts & data › Prenatal lunation

Prenatal Lunation Chart

Find the last exact New or Full Moon before a recorded birth time, then see a chart of the planets at that moment. You can also choose the last New Moon or last Full Moon separately.

STAR & SIGIL

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Open Birth Chart

How this chart is calculated

A lunation is a New Moon (Sun–Moon conjunction in geocentric ecliptic longitude) or Full Moon (opposition). The default selects whichever occurred last before the entered birth instant. The chart shows the planets at that phase’s UTC time, not at birth.

The event occurs at one worldwide instant. This chart has no Ascendant or houses because no location was entered for the lunation chart. Planetary positions use the tropical zodiac and the same longitude convention as the phase search. Exact phase times can differ slightly between ephemerides.

Method: Astronomy Engine, SearchMoonPhase.

Method and limits

Finding the preceding phase

The calculator searches backward from the converted UTC birth instant. A New Moon is the Sun and Moon at the same geocentric ecliptic longitude; a Full Moon is their 180° separation. It reports the exact event time and how long before birth it occurred.

What the wheel contains

The wheel and table show Sun, Moon, and planetary tropical positions at the lunation instant, rather than at birth. The phase calculation and plotted longitudes use the same geocentric convention, so the luminaries align in the New Moon view and oppose in the Full Moon view.

Why houses are absent

The lunation is one worldwide instant, but the form does not select a place for its local horizon. Ascendant and house cusps are therefore omitted. This is a reference chart for a traditional timing technique, not an outcome claim or a substitute for the individual birth chart.

For an unknown birth time, the date-only check compares the first and last minute of the entered local day using one historical UTC offset. A clock change on that date needs both applicable offsets checked separately. Event times remain UTC; the displayed wheel has no location-dependent Ascendant or houses.