Why is the month 28 days?

I dizzy.,Suddenly found out that tomorrow is March 1st.,I was going to finish the outline of this book.,And then open a new book.,The end of the outline and the heart of the book.,2 choose 1,I tossed a coin to decide.。

"Absurd Fairy Tale: My Fourth Natural Disaster, Please Advise" Why is this month 28 days? I am hitting it in my hand, please wait a moment,

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