Church of Light Progression Geometry

Status: implemented chart-backed adapter with primary-source worked-example validation and modern JPL-kernel corroboration

Date: 2026-07-12

1. Governing Product

moira.progressed_astrodynes_chart derives the astronomical geometry required by the fixed doctrine in moira.progressed_astrodynes. It is a separate, kernel-backed product. It does not treat similarly named generic progression functions as proof of Church of Light semantics.

The adapter accepts a timezone-aware natal datetime, target datetime, observer latitude/longitude, house system, and explicit fallback policy. Its result retains time-key derivation, house-system truth, four terminal tiers, and the complete progressed Astrodyne calculation.

2. Primary Sources

The source-derived time and angle rules were checked against the Church of Light Serial Lessons:

• The Hermetic System of Progressions
• Major Progressions of Sun and Angles
• Minor Progressions of Sun and Angles
• Minor Progressions of Moon and Planets
• Elbert Benjamine and W. M. A. Drake, The Astrodyne Manual (1946), local source C:\Users\nilad\Downloads\Astrodyne-Manual.pdf

These sources govern the astrological time keys. JPL DE441 governs modern planetary-position computation; it is corroboration for the historical worked positions, not the authority for the progression doctrine.

3. Declared Derivation

3.1 Limiting Date

The interval between Greenwich noon and the natal EGMT is converted with:

• two birth-time hours to one symbolic month
• four birth-time minutes to one symbolic day
• 30-day symbolic months

The signed interval is applied oppositely to the birth date. The result is an explicit ChurchOfLightSymbolicDate; it is not collapsed into an ordinary Gregorian date before major progression arithmetic.

3.2 Major Ephemeris Date

One completed life year advances one ephemeris day from the Limiting Date. Within the current life year, one calendar month advances two ephemeris hours and one calendar day advances four ephemeris minutes. The adapter records both the calendar offset and resulting EGMT interval.

3.3 Minor Ephemeris Date

The Solar Constant is the natal Sun minus natal Moon longitude. At the target date, the transit Sun minus this constant defines the required minor Moon longitude. The approximate date advances 27.3 ephemeris days per life year; the admitted root solve then finds the nearby ephemeris instant where the Moon reaches the required longitude. The selected root and target longitude are both retained.

3.4 Angles and Terminal Frame

The Midheaven Constant is the natal M.C.-Sun relationship. The major progressed M.C. is therefore the natal M.C. plus the major solar arc. The progressed Ascendant is reconstructed from that M.C., the natal latitude, obliquity, and the selected house method. Radical, major, minor, and transit terminals are all assigned to the natal house figure for practical distribution.

Planetary longitudes and declinations use Moira's geocentric apparent planetary path. Requested and effective house systems and any explicitly permitted fallback remain visible.

4. Worked-Example Validation

The Benjamine example uses:

• natal EGMT: 1882-12-12 12:11:26 UTC
• target: 1949-08-29 12:00:00 UTC
• latitude: 41 degrees 37 minutes north
• longitude: 94 degrees west

Pinned witnesses:

Product	Printed witness	Modern reconstruction	Tolerance
Limiting Date	1882-12-09 plus 3h24m	1882-12-09.141666...	exact symbolic arithmetic
Major ephemeris date	1883-02-17 near -6h42 EGMT	1883-02-17 near -6h40.6	source rounding boundary
Major Sun	328.25 deg	328.24584 deg	0.02 deg
Minor ephemeris date	1887-12-09	1887-12-09	date witness
Minor Moon	178.70 deg	178.69752 deg	0.02 deg
Minor Mercury	236.58333 deg	236.58277 deg	0.02 deg
Minor Neptune	58.16667 deg	58.17392 deg	0.02 deg
Transit Neptune	193.51667 deg	193.50936 deg	0.02 deg

This is a named, bounded comparison. It does not claim that a modern kernel and modern house implementation reproduce every printed historical chart value. The source manual's internally inconsistent dated rows and aggregate statements remain recorded in progressed_astrodynes_manual_discrepancies_2026-07-12.md; those publication errors are not Moira compatibility targets.

5. Public Surfaces

• church_of_light_progression_geometry(...)
• church_of_light_progressed_astrodynes_chart(...)
• Moira.progressed_astrodynes_geometry(...)
• Moira.progressed_astrodynes_chart(...)
• POST /v1/astrodynes/progressed/chart

The REST response exposes full geometry, natal result, normal progressed horoscope, major/minor/transit relations, reenforcements, practical totals, and provenance. Scalar and explicit-geometry routes remain kernel-free.

6. Search and Variable-Rate Extension

moira.progressed_astrodynes_search now admits the deferred bounded products:

• one-degree entry and exit chronology
• exact perfection or explicitly named closest approach
• minor reenforcement peaks against a named major relation
• composite-trapezoid integration of actual ephemeris-varying instantaneous power, harmony, and discord

The source governs the one-degree threshold and instantaneous power curve. Numerical bracketing, minimization, and quadrature are labeled as Moira methods. Every result exposes its numerical policy and keeps the manual's conditional constant-rate total as a comparator.

Arbitrary prediction/advice, unbounded sweeps, and hidden automatic aspect discovery remain outside this product.