[eltociear]

I created Japanese translated README.

[Verchiel666]

Reviewed the full diff against README.en.md — the Japanese translation is accurate and complete:

• All figures check out: 674,976 charts / 8,774,688 readings / 56.6 GB / ~20.4 billion characters (約204億文字), the v3.0 comparison table (+30% / +71% / +17 years / +44%), the 2,160-chart estimation note, and the content version ca268829f7a9.
• All technical details preserved correctly: the true-solar-time late-Zi-hour note (#63) including the 23:30 clock / 22:10 true solar / Hai-hour example, the invalid leap-month policy change (#71), clock-adjust.ts semantics, the zstd -d --long=27 requirement, the sample-dataset known issue (2,520 / 0.49%), and the license table (MIT / CC BY 4.0 / CC BY-NC-SA 4.0 / public domain).
• Bilibili timestamps (00:25:27 t=1527, 00:03:15 t=195, 00:25:43 t=1543) and all section links match the English version.
• Language reads naturally and terminology (時辰, 四化, 晩子時, 真太陽時) is rendered consistently.

Two tiny non-blocking nits, fine to leave as-is:

1. "起こりえない化に関する文" is slightly ambiguous at first glance — "起こりえない四化に関する文" would be clearer.
2. The ouranic.cn links reuse ?from=gh-readme-en; a gh-readme-ja variant would let you attribute Japanese-README traffic separately, if you track that.

Docs-only change, no code touched, mergeable. Approving.