Jesse_ChenandClaude Opus 5.5
c35e0195e1
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8
63 lines
2.8 KiB
Python
63 lines
2.8 KiB
Python
#!/usr/bin/env python3
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"""Sidereal MC for `/api/bhava_chalit` (BUG-1077).
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Sripati and Porphyry trisect the quadrants between the ascendant and the MC.
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The endpoint used to default a missing `mc_lon` to `asc + 270`, which makes
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every quadrant exactly 90 degrees: the chart silently became equal houses and
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no planet could ever change house. This module is the only place the endpoint
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gets an MC from:
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1. an explicit `mc_lon` in the body wins (existing callers and tests);
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2. otherwise, with the birth moment and place in the body, the MC comes from
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Swiss Ephemeris `houses_ex` in the sidereal frame of the request's ayanamsa,
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the same call the full-reading producer uses
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(`jyotish_engine._build_natal_foundation_modules`);
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3. otherwise a house system that needs the MC is refused, never guessed.
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House systems that do not read the MC keep the old placeholder, which only
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appears as the echoed `mc_lon`.
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"""
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from __future__ import annotations
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from typing import Any
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from ayanamsa_utils import normalize_ayanamsa_name, temporary_ayanamsa
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MC_HOUSE_SYSTEMS = frozenset({'sripati', 'porphyry'})
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_BIRTH_KEYS = ('year', 'month', 'day', 'hour', 'lat', 'lon')
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def _has_birth_moment(body: dict) -> bool:
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return all(body.get(key) is not None for key in _BIRTH_KEYS)
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def sidereal_mc_from_birth(handler: Any, body: dict) -> float:
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"""MC longitude in the request's sidereal frame, from the birth moment."""
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import swisseph as swe
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year = handler._get_int(body, 'year', 1990, 1800, 2400)
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month = handler._get_int(body, 'month', 6, 1, 12)
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day = handler._get_int(body, 'day', 15, 1, 31)
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hour = handler._get_float(body, 'hour', 12, 0, 23)
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minute = handler._get_float(body, 'minute', 0, 0, 59)
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second = handler._get_birth_second(body)
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lat = handler._get_float(body, 'lat', 0, -90, 90)
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lon = handler._get_float(body, 'lon', 0, -180, 180)
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tz = handler._parse_timezone(body, lat, lon, year, month, day, hour, minute, second)
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jd = swe.julday(year, month, day, handler._birth_hour_decimal(hour, minute, second) - tz)
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name = normalize_ayanamsa_name(body.get('ayanamsa') or body.get('ayanamsa_name'))
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with temporary_ayanamsa(name, swe):
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_, ascmc = swe.houses_ex(jd, lat, lon, b'R', swe.FLG_SWIEPH | swe.FLG_SIDEREAL)
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return float(ascmc[1]) % 360
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def resolve_bhava_mc_lon(handler: Any, body: dict, house_system: str, asc_lon: float, bad_request: type[Exception]) -> float:
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if body.get('mc_lon') is not None:
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return handler._normalize_degree(body, 'mc_lon', 0)
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if _has_birth_moment(body):
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return sidereal_mc_from_birth(handler, body)
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if house_system in MC_HOUSE_SYSTEMS:
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raise bad_request(f'{house_system} needs mc_lon or the birth date, time and place (year, month, day, hour, lat, lon)')
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return (asc_lon + 270) % 360
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