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# BPHS Chapter 48 Narayana Dasha
## 概述
Narayana Dasha(亦作 Rishi Dasha / Padakrama Dasha)是 Parasara 体系中的另一种大运系统,
以 Lagna 为起点,按黄道十二星座顺序推进,每个星座的大运长度取决于该星座的守护星
到该星座的"步数"。
## 计算方法(PVN Rao / BPHS Ch.48 传统算法)
1. 从 Lagna 所在星座开始
2. 按黄道顺序(白羊→金牛→双子→...→双鱼)遍历 12 星座
3. 每个星座的大运年数 = 该星座守护星所在星座到该星座的"步数"
- 例如:Lagna 在白羊,白羊守护星 Mars 在巨蟹 = 4 步 → 白羊大运 4 年
## 当前实现状态
当前 `scripts/narayana_dasha.py` 实现了基础算法,覆盖:
- Lagna 起运
- 黄道序 12 星座推进
- 守护星步数计算
## 局限
- 未完整覆盖 BPHS Ch.48 所有变体
- 未与 PyJHora Narayana Dasha 做基准比对
- 当前标注为 **covered**,待 benchmark 后确认
## 参考
- BPHS Chapter 48 (Rao 英译)
- PyJHora Narayana Dasha 输出
- PVN Rao "Dasa Systems in Hindu Astrology"