732642856
96 lines
3.4 KiB
Python
96 lines
3.4 KiB
Python
#!/usr/bin/env python3
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"""Swiss-Ephemeris Gulika calculator using the Prasna Marga Ghatika table."""
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from __future__ import annotations
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from datetime import datetime
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from typing import Any
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import swisseph as swe
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try:
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from saham_daynight import determine_daytime
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except ImportError:
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from scripts.saham_daynight import determine_daytime
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# Monday=0, matching datetime.weekday(). Values are the end of Saturn's share
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# measured in Ghatika from the relevant sunrise/sunset (30 Ghatika per period).
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GHATIKA_END = {
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0: {"day": 22, "night": 6},
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1: {"day": 18, "night": 2},
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2: {"day": 14, "night": 26},
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3: {"day": 10, "night": 22},
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4: {"day": 6, "night": 18},
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5: {"day": 2, "night": 14},
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6: {"day": 26, "night": 10},
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}
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# Saturn's zero-based share in eight equal day/night parts. Python weekday:
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# Monday=0. This is the variant used by PyJHora's public black-box oracle.
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SATURN_PART_START = {
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0: {"day": 5, "night": 1},
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1: {"day": 4, "night": 0},
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2: {"day": 3, "night": 6},
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3: {"day": 2, "night": 5},
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4: {"day": 1, "night": 4},
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5: {"day": 0, "night": 3},
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6: {"day": 6, "night": 2},
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}
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def _sidereal_ascendant(jd_ut: float, lat: float, lon: float) -> float:
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swe.set_sid_mode(swe.SIDM_LAHIRI)
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cusps, ascmc = swe.houses_ex(jd_ut, lat, lon, b"P", swe.FLG_SIDEREAL)
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return float(ascmc[0]) % 360
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def calculate_gulika(
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moment: datetime,
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*,
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lat: float,
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lon: float,
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tz: float,
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method: str = "saturn_part_start",
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) -> dict[str, Any]:
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"""Return Gulika from local moment/location using Swiss sunrise and sunset."""
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daynight = determine_daytime(moment, lat=lat, lon=lon, tz=tz)
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is_day = bool(daynight["is_daytime"])
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period = "day" if is_day else "night"
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start_jd = daynight["sunrise_jd_ut"] if is_day else daynight["sunset_jd_ut"]
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end_jd = daynight["sunset_jd_ut"] if is_day else daynight["sunrise_jd_ut"] + 1.0
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if end_jd <= start_jd:
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end_jd += 1.0
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start_year, start_month, start_day, _ = swe.revjul(start_jd + float(tz) / 24.0)
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period_weekday = datetime(int(start_year), int(start_month), int(start_day)).weekday()
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if method == "saturn_part_start":
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part_index = SATURN_PART_START[period_weekday][period]
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segment_fraction = part_index / 8.0
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ghatika_end = None
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elif method == "legacy_ghatika_end":
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part_index = None
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ghatika_end = GHATIKA_END[period_weekday][period]
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segment_fraction = ghatika_end / 30.0
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else:
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raise ValueError("method must be saturn_part_start or legacy_ghatika_end")
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segment_jd = start_jd + (end_jd - start_jd) * segment_fraction
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longitude = _sidereal_ascendant(segment_jd, float(lat), float(lon))
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return {
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"scope": "gulika_prasna_marga",
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"status": "partial",
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"longitude": round(longitude, 6),
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"sign_idx": int(longitude / 30) % 12,
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"degree_in_sign": round(longitude % 30, 6),
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"period": period,
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"weekday": period_weekday,
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"moment_weekday": moment.weekday(),
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"method": method,
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"part_index": part_index,
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"segment_fraction": segment_fraction,
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"ghatika_end": ghatika_end,
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"segment_jd_ut": segment_jd,
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"daynight_evidence": daynight,
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"ayanamsa": "lahiri",
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"rule_source": "references/prashna-complete-guide.md#3.5",
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"boundary": "PyJHora-aligned Saturn-part-start variant. Numeric parity is evidence only and does not enable Prashna verdict layers.",
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}
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