# Equinox Passage v1

- Official system name: The 13 Moons Remnant Living Time Observatory.
- Fixed Pattern anchor: April 17, 2026 = Moon 1 · Day 1 · Day 1/364.
- Passage start: exact astronomical March equinox instant.
- Passage end: beginning of Moon 1 Day 1 under the selected boundary model.
- Shared versions:
  - `astronomy/1.0.0`
  - `equinox-passage/1.0.0`
  - `pattern-calendar/1.0.0`
- Bundled reference years: 2014–2026.
- Bundled study timezone: America/Los_Angeles.
- Bundled boundary model: sunset with `18:00` fallback unless the user supplies another sunset value.
- Astronomical source policy:
  - exact UTC instants are copied from a bundled third-party reference table and validated against an independent cross-check table;
  - the repository currently cannot verify the exact original Skyfield version or JPL kernel, so those fields remain `unknown` in the source metadata and reduce the source-integrity status;
  - Pattern calculations are deterministic and separate from astronomy;
  - lunar values are calculated at the equinox instant with a deterministic synodic approximation and labeled as approximate.
- Timestamp language:
  - Timestamp resolution: 1 second.
  - Validation tolerance: 3 seconds.
  - Maximum measured deviation: 2.057 seconds.
  - Maximum-deviation year: 2022.
- Canonical dataset policy:
  - committed annual JSON and historical CSV contain stable annual facts only;
  - runtime state is computed separately as `liveState` with `evaluatedAt`, `status`, `elapsedMilliseconds`, `remainingMilliseconds`, and `progress`;
  - canonical exports must stay byte-stable for the same source metadata and declared boundary settings.
- Deterministic generator:
  - `node scripts/generate-equinox-passage-data.mjs`
  - `node scripts/generate-equinox-passage-data.mjs --verify`
- Boundary explanation:
  - in sunset or manual-sunset mode, Moon 1 Day 1 begins at the selected sunset boundary on the preceding civil evening;
  - the astronomical equinox instant never changes; only the Pattern-date mapping and passage-end boundary change.
- Renderer-neutral visualization data must expose normalized values for future Living Time Sphere work.
- Symbolic interpretation must remain visibly separate from astronomical fact, Pattern calculation, and personal observation.