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小学数学第七册在“年,月、日”这个单元里,简单地介绍了平年和闰年的知识。由于学生年龄较小,教材只讲了“通常每4年有一个闰年”,这个计算闰年的方法不够准确,教师应该对计算闰年的方法及其根据有进一步的了解。地球自转一周所需要的时间叫做一日,一日约24小时。地球围绕太阳公转一周需要365日5小时48分46秒,这个时间叫做太阳年。为了方便,我们把365日定为一年,叫做平年。因为按平年365日计算,一年少算5小时48分46秒,4年就少算23小时
The seventh grade of elementary mathematics in the “year, month, day” this unit, simply introduced the knowledge of the year and leap year. Due to the age of the students, the textbook only states that “usually there is a leap year every four years.” This method of calculating leap years is not accurate enough. Teachers should have a further understanding of the method for calculating leap years and their basis. The time it takes for the Earth to spin a week is called a day, about 24 hours a day. It takes 365 days, 5 hours, 48 minutes and 46 seconds for the Earth to revolve around the sun. This time is called the year of the sun. For convenience, we set 365 days as a year, called flat year. Because according to the calculation of 365 days a year, a year less than 5 hours 48 minutes and 46 seconds, less than 4 hours 23 hours