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Why is 「昨夜」 pronounced as 「ゆうべ」 {yuube} and 「今日」 as 「きょう」 {kyou}?

「ゆう」 is neither the kun'yomi nor on'yomi of 「昨」 and 「べ」 is not a pronunciation of 「夜」 either. The same can be said about the pronunciation 「きょう」 for 「今日」. So how come the pronunciations of the two ...