标出研究章和 PyJHora 的已知差别（#92）。

10 张虚构盘逐体系对照。不一致的方法在标题下写明差在哪一类。本命 Tithi 顺行一致，逆行没有公开函数。Windows 上 1970 年以前的日出不再用 fromtimestamp。

自测：合同与研究章测试通过；200 张英文扫描约 1956 秒通过。未跑全量 pytest、快速门和前端。

Co-Authored-By: Grok (agent loop)

scripts/research_timing/render.py

@@ -6,9 +6,11 @@ on the packet, and they are not sent to chat cards or rectification.
 
 from __future__ import annotations
 
+import json
 import logging
 import re
 from datetime import datetime, timedelta, timezone
+from pathlib import Path
 
 logger = logging.getLogger(__name__)
 
@@ -291,7 +293,56 @@ def _chapter(title: str, language: str, body: str) -> str:
 
 
 def _family_block(title: str, language: str, body: str) -> str:
-    return f"## {title}\n\n{BANNER[language]}\n\n{body.strip()}"
+    note = _pyjhora_note(title, language)
+    text = f"## {title}\n\n{BANNER[language]}"
+    if note:
+        text += "\n\n" + note
+    if body.strip():
+        text += "\n\n" + body.strip()
+    return text
+
+
+_PYJHORA_NOTES: dict | None = None
+
+
+def _pyjhora_notes() -> dict:
+    """Committed offline comparison. Missing or unread JSON adds no label."""
+    global _PYJHORA_NOTES
+    if _PYJHORA_NOTES is None:
+        path = Path(__file__).resolve().parents[2] / "docs" / "tasks" / "research-timing-pyjhora-20261023.json"
+        notes: dict[tuple[str, str], str] = {}
+        try:
+            payload = json.loads(path.read_text(encoding="utf-8"))
+        except (OSError, json.JSONDecodeError):
+            payload = {}
+        systems = payload.get("systems") if isinstance(payload, dict) else None
+        for item in (systems or {}).values():
+            if not isinstance(item, dict) or item.get("status") != "不一致":
+                continue
+            zh = str(item.get("heading_zh") or "")
+            en = str(item.get("heading_en") or "")
+            category = str(item.get("category") or "")
+            category_en = str(item.get("category_en") or "")
+            match = item.get("match") or "exact"
+            if zh and category:
+                notes[("zh", zh, match)] = f"与 PyJHora 不一致：差在 {category}"
+            if en and category_en:
+                notes[("en", en, match)] = f"Differs from PyJHora: {category_en}"
+        _PYJHORA_NOTES = notes
+    return _PYJHORA_NOTES
+
+
+def _pyjhora_note(title: str, language: str) -> str:
+    best = ""
+    found = ""
+    for (lang, heading, match), sentence in _pyjhora_notes().items():
+        if lang != language or not heading:
+            continue
+        if title == heading or (match == "prefix" and title.startswith(heading + " ")):
+            if len(heading) >= len(best):
+                best = heading
+                found = sentence
+    return found
 
 
 def _heading(key: str, language: str) -> str:

scripts/research_timing/search.py

@@ -24,6 +24,21 @@ except ImportError:  # pragma: no cover - package import
 _STEP = 0.125
 _BISECTIONS = 45
 _TOLERANCE = 1e-6
+_UNIX_EPOCH_JD = 2440587.5
+
+
+def _utc_from_jd(jd: float) -> datetime:
+    """UTC from a Julian day. Windows ``fromtimestamp`` rejects instants before 1970."""
+    unix = (float(jd) - _UNIX_EPOCH_JD) * 86400.0
+    seconds = int(unix)
+    micros = int(round((unix - seconds) * 1_000_000))
+    if micros >= 1_000_000:
+        seconds += 1
+        micros -= 1_000_000
+    elif micros < 0:
+        seconds -= 1
+        micros += 1_000_000
+    return datetime(1970, 1, 1, tzinfo=timezone.utc) + timedelta(seconds=seconds, microseconds=micros)
 
 
 def find_returns(
@@ -248,7 +263,7 @@ def hindu_solar_events(moment: datetime, latitude: float, longitude: float) -> l
                 flags=flags,
             )
             if status == 0 and jd <= times[0] < jd + 1:
-                stamp = datetime.fromtimestamp((times[0] - 2440587.5) * 86400, timezone.utc)
+                stamp = _utc_from_jd(times[0])
                 events.append({"event": name, "datetime_utc": stamp.isoformat()})
     events.sort(key=lambda row: row["datetime_utc"])
     return events