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Birth Moon Phase Calculator

Discover which moon phase you were born under. The Moon phase at birth reveals your inner rhythm and life purpose.

Sources: NASA -- Moon Phase Calculator · Astro.com -- Lunar Phases in the Natal Chart

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How the Birth Moon Phase Calculator Works

The birth moon phase is determined by the angle between the Sun and Moon at the exact moment of your birth. This angle, ranging from 0° to 360°, divides the lunar cycle into 8 distinct phases, each with a specific meaning for your personality and life purpose.

The 8 Lunar Phases

  • New Moon (0°-45°): phase of sowing. Instinctive, pioneering personality.
  • Crescent Moon (45°-90°): phase of struggle. Determined, combative personality.
  • First Quarter (90°-135°): phase of action. Decisive, constructive personality.
  • Gibbous Waxing (135°-180°): phase of refinement. Analytical, devoted personality.
  • Full Moon (180°-225°): phase of illumination. Aware, relational personality.
  • Gibbous Waning (225°-270°): phase of dissemination. Communicative, inspiring personality.
  • Last Quarter (270°-315°): phase of reform. Critical, transformative personality.
  • Balsamic Moon (315°-360°): phase of completion. Spiritual, visionary personality.

The Astrological Meaning

The birth moon phase adds an important dimension to natal chart interpretation. While the moon sign describes "how" you experience emotions, the moon phase describes the "why": the inner rhythm that guides your life path.

Frequently Asked Questions

What are birth moon phases?▼
Birth moon phases are the 8 phases of the Sun-Moon cycle at the moment you were born. They are calculated by measuring the angle between the Sun and Moon in the natal chart. Each phase lasts about 3.5 days and represents a different "life purpose."
How many lunar phases exist?▼
The lunar cycle is divided into 8 main phases: New Moon (0°-45°), Crescent Moon (45°-90°), First Quarter (90°-135°), Gibbous Waxing (135°-180°), Full Moon (180°-225°), Gibbous Waning (225°-270°), Last Quarter (270°-315°), and Balsamic Moon (315°-360°).
Is the birth moon phase different from the moon sign?▼
Yes, they are two different concepts. The moon sign indicates which zodiac sign the Moon is in and reveals your emotional style. The moon phase indicates the angular relationship between Sun and Moon and reveals your vital rhythm and existential purpose.