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I've seen asu and ashita both used as furigana for the same kanji (明日).

Is there a big, subtle or no difference in meaning and usage?

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My dictionary says あす is more polite than あした.

And 明日 has an another reading like みょうにち and this is more polite あす.

I know みょうにち is polite but I didn't know あす is more polite than あした. I think Japanese who know this difference isn't many.

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