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Haimen Teacher's affiliated country, Xiao Tangfen, was fine on Monday, February 28th. Today is February 28th. On March 23rd, it is my mother's birthday. I will give it to me. After 24 days, my mother's birthday will run happily. To my mother, mysteriously said: "Do you know what day is it 24 days?" Mom thought about it: "On March 25, it’s normal!" I laughed and laughed. : "Mom is really stupid, even the days will not be counted. It will be your birthday for 24 days!" "Hey, is it? Let me count it." Mom said that she was pulling her finger. Count the language. After a minute or so, my mother said affirmatively: "No, I am sure, after 24 days, it will be March 25th, not my birthday. I will see you again!" "Hey," I said loudly. After counting it, "29th, 30th" has not waited for me to finish, my mother shouted "stop", "After 28th is the number?" "29th!" I was confused, "28 days later is 29 "Where is it wrong?" When Mom saw me confused, she asked: "Are you thinking about it for a few months now?" I thought slowly in my heart: "Now is February." "Hey," I am big. Cried out: "Now in February, there are days in February, there are also 29 days. 28 days called Pingian, 29 days called Shunian. This year 2005, with 2005/4, except for not enough, so it is normal, then In February, it was applied for 28 days. "Mom listened, and nodded, and asked: "Do you know why there are 29 days in February of the next year, one more day than normal?" I proudly said: "Of course, because of the earth's rotation The standard time of the week is 59 hours, 59 minutes and 56 seconds. Over time, every four years, there will be one more day, so the day when the goalkeeper will be extra. That year is called the leap year." "Well, do you know why you want to add one day in February?" Mom asked again, "I know," I said proudly: "In order to match the calendar with the Earth's revolution period." "My mother listened, and said happily: "I didn't expect your little girl to be very smart?" I said naughtyly: "That is of course!" Tang Weihua

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