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RELEASE_NOTES_6.4.0

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TheDaniel166 edited this page Oct 15, 2026 · 3 revisions

Moira 6.4.0 - Natal Aspect Grid and Delta-T Scenario

Release date: 2026-09-02

Public upgrade path: 6.3.0 to 6.4.0.

Moira 6.4.0 is a timing minor. It admits one new search product, the natal aspect grid, and recalibrates the default future Delta-T scenario from published sources. Every 6.3.0 request body stays valid. The Hellenistic profile method remains moira.hellenistic_chart_profile.v2.

In this release

  • Natal aspect grid — find_aspect_transits_to_longitudes() and Moira.natal_aspect_transits() search one moving planet against many frozen ecliptic longitudes for many aspect angles at once. One native longitude series of the mover is scanned over the window; every (longitude, angle) pair is refined from it by the existing bisection. Results are AspectTransitEvent objects ordered by jd_exact, the same vessel find_aspect_transits() returns.
  • Frozen-target native pre-filter — find_aspect_transits() with a numeric target now takes the same hybrid native scan that planet-to-planet searches already used. The pure-Python search is unchanged and still runs when the native scan is unavailable.
  • Native bindings — ecliptic_longitude_batch (true ecliptic longitude of date for a body/observer evaluator pair over a JD series) and find_aspects_to_longitude.
  • Delta-T future scenario — the default post-observation curve is D0 + 29.09·((year − Y0)/100)² from Morrison et al. 2021 tidal 43.7 s/cy² and Shahvandi et al. 2024 GIA −0.80 ms/cy. The linear handoff slope is no longer consumed. ΔT(2100) moves from 83.29 s to about 85.00 s. Source-era totals, EOP, and DeltaTPolicy names are unchanged.
  • Doctrine note — WHY_MOIRA_DOES_NOT_COMPRESS_DEXX.md explains reading published JPL DExx kernels instead of a second Chebyshev pack, with a file-reading comparison against Swiss .se1 and a locked-TT milliarcsecond check against DE441.

REST contracts

POST /v1/transits/natal-aspects
POST /v1/batch/events   kind: natal_aspect_transits

POST /v1/transits/natal-aspects takes body, natal_longitudes, aspect_angles, optional parallel aspect_orbs, jd_start, jd_end, and search_motion. The batch item takes the same three list fields; when aspect_orbs is omitted there, the item's orb applies to every angle. Both return the aspect_transit event shape already used by /v1/batch/events. Extra request keys remain 422.

Not in 6.4.0

  • Transit interpretation, scoring, or narrative
  • A second aspect solver or a Gantt/timeline product
  • Mixed-technique timing bundles (progressions, directions, returns in one call)
  • Climate ice-melt terms in the Delta-T scenario
  • Website or Urania Workspace surfaces

Install

pip install moira-astro==6.4.0

from moira import Moira, Body
from moira.facade import find_aspect_transits_to_longitudes

m = Moira()
hits = m.natal_aspect_transits(Body.SATURN, natal_points, [0.0, 90.0, 180.0], jd_start, jd_end, aspect_orbs=[1.0, 1.0, 1.0])

Read COMPATIBILITY_NOTES_6.4.0.md before regenerating OpenAPI clients or comparing future-dated delta_t values against 6.3.0 output.

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