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Incidentally, Thai language also seems to follow the celestial bodies - probably from Sanskrit, I would guess.

Putting them in English script:

Monday = Wan Jan (Moon)
Tuesday = Wan Angkarn (Mars)
Wednesday = Wan Poot (Mercury)
Thursday = Wan Pha-reu-hat (Jupiter)
Friday = Wan Suk (Venus)
Saturday = Wan Sao (Saturn)
Sunday = Wan Aathit (Sun)