The Greenery Day reference article from the English Wikipedia on 24-Apr-2004
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Greenery Day

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Greenery day (みどりの日) is one of the holidays for Japanese citizen. It is the April 29th. Until 1989, it was the birthday of the *Showa emperor. But, in 1989, The name "birthday of the emperor"was changed into Greenery day. It is a day to commune with nature, and at the same time, thank to the blessing, and for fostering abundant spirit.