Mansions of the Moon
Stuart Woolley
The Moon passes through 28 mansions as it circles the ecliptic — each governed by an angel, each carrying distinct magical influences. This system of celestial magic is older than the tropical zodiac itself, transmitted from Arabic astrologers through Agrippa's Three Books of Occult Philosophy to Barrett's Magus, and onward into the Golden Dawn tradition and modern ceremonial practice. Mansions of the Moon calculates the Moon's precise ecliptic longitude using the astronomical algorithms of Jean Meeus and tells you which mansion it currently occupies, which angel governs it, and what influences are in play — tonight and every night. The 28 mansions divide the ecliptic into equal arcs of 12°51', starting from 0° Aries. As the Moon completes its sidereal month, it passes through each mansion in turn. Each station has its own ruling angel, its own traditional effects drawn from Barrett's Magus (1801), and its own expanded guidance for modern practice. FEATURES • Real-time lunar mansion calculation from ecliptic longitude — not the approximate synodic age method, but proper positional astronomy • All 28 mansions with ruling angels, traditional effects, zodiac signs, degree ranges, and alternative names from the Arabic tradition • Moon phase display with phase-accurate visualisation and illumination percentage • Expanded essays for every mansion — magical operations, historical notes on the Arabic-Latin-English transmission, and practical guidance for contemporary practitioners • Visual mansion wheel showing the Moon's current position on the ecliptic, with zodiac signs colour-coded by element • Browse and filter mansions by magical category: Travel, Love, Conflict, Healing, Prosperity, Captives, Buildings, and Discord • Detailed essays on the three principal source texts — the Picatrix, Agrippa, and Barrett — tracing the chain of transmission from medieval Arabic courts to modern ceremonial magic • Dark grimoire interface designed for the aesthetic of stone and candlelight, not the Llewellyn catalogue THE SOURCES The mansion names, angel attributions, and traditional effects are drawn from Francis Barrett's The Magus (1801), which transmits the system from Heinrich Cornelius Agrippa's Three Books of Occult Philosophy (1531), which in turn draws from the Arabic Picatrix (c. 1000 CE). All source material is public domain. The expanded interpretive essays are original. THE ASTRONOMY The lunar longitude calculation uses the principal periodic terms from Chapter 47 of Jean Meeus' Astronomical Algorithms, providing accuracy to approximately 0.3° — more than sufficient for mansion determination, where each mansion spans nearly 13°. No internet connection required. No location services. The Moon is in the same mansion for everyone on Earth at any given moment. No ads. No tracking. No subscriptions. No in-app purchases. No data collection of any kind. The grimoire is complete. Do also check out our related app, Wiccan Moon.