Timmy 3407170b8c Add ephemeris download script and update README ...

- Add download_ephemeris.sh script for automated JPL ephemeris file downloads
- Support de421, de422, and de440s ephemeris files
- Update README.md with download script usage instructions
- All text in Traditional Chinese

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-09 14:15:25 +08:00

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