“Orion's belt” in Japanese
Short answer
Orion's belt in Japanese is “三ツ星” (mitsuboshi). Full meaning: three stars (shape); three stars (rating); Orion's belt, Chinese "Three Stars" constellation (one of the 28 mansions).
Other ways to say “Orion's belt” in Japanese
三ッ星
mitsuboshi three stars (shape); three stars (rating); Orion's belt, Chinese "Three Stars" constellation (one of the 28 mansions)
三つ星
mitsuboshi three stars (shape); three stars (rating); Orion's belt, Chinese "Three Stars" constellation (one of the 28 mansions)
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