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MOON · HISTORICAL ASTROLOGY

28 Lunar Mansions Calculator

Enter a UTC date and time or use the current UTC minute. See the Moon’s numbered mansion and when it entered and will leave that equal tropical sector.

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Find the Moon’s mansion

The calculation uses 28 equal portions of the tropical zodiac beginning at 0° Aries. Enter UTC; the page does not infer a local time zone.

No birth data, location, account, or app connection is needed. A timezone offset must be applied before entering a local civil time here.

What the result means

At the entered instant, the local browser ephemeris gives the Moon’s apparent geocentric ecliptic longitude. Dividing its tropical longitude by 360°/28 assigns one numbered sector. The exact previous and next entries are estimated by scanning the Moon’s motion and refining each longitude crossing. They are moments in UTC, not local calendar days or a one-mansion-per-date lookup.

The labels come from Agrippa’s 1651 English witness to an older Arabic and Latin tradition. His text also identifies stars and says the mansions belong to the “eighth sphere.” A star-anchored historical reconstruction can place boundaries elsewhere after precession; this page deliberately implements equal tropical sectors from 0° Aries. It does not claim that Agrippa himself used today’s tropical zero point for every calculation.

Read the complete 28-name table, sources, and method limits →

Sources and calculation notes

  1. Heinrich Cornelius Agrippa, Three Books of Occult Philosophy, II.33, in the 1651 English translation digitized by Joseph H. Peterson. The chapter supplies the 28 names, older spellings, star images, and a division of about 12°51′26″. Peterson’s notes identify the Arabic forms. Its “eighth sphere” wording belongs to a star-referenced historical cosmology; our tropical zero point is a declared modern convention.
  2. Agrippa II.46 describes attributed images and ritual uses. These are reported historical practices, not experimentally established effects or instructions implied by this calculator.
  3. Astronomy Engine JavaScript documentation describes the bundled ephemeris. This page computes apparent geocentric ecliptic longitude from its Moon vector. Crossings are found numerically and rounded to the nearest second.
  4. India’s Positional Astronomy Centre, Rashtriya Panchang explanation describes nakshatra within the Vedic panchanga. Its usual 27 sidereal sectors are a separate calculation and naming tradition.