2020年是一个闰年,2月29日这个闰日即将登场。为什么会有闰年和闰日呢?其实,这是一个历史遗留问题。而且,4年有多少个小时,闰日也不是“四年等一回”那么简单。,
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At some point in elementary school,your science teacher probably explained to you that there are 365 days in a year because that’s how long it takes for Earth to complete one full rotation around the sun. What they might not have specified,however,is that it’s not exactly 365 days—it’s actually closer to 365.2421 days.
上小学时,你们的科学老师很可能会向你们解释一年有365天,因为这是地球绕太阳公转一圈的时间。不过,他们可能没有详细说明,地球公转一圈并不是精确的365天,实际上说是365.2421天更准确一些。
So,if we want our calendar year to begin right when Earth begins a new rotation around the sun,we have to account for (roughly) an extra quarter of a day each year,or one day every four years. History.com reports that the Egyptians had already been doing this for a while before Europe finally caught on in 46 BC,when Roman dictator Julius Caesar and astronomer Sosigenes put their heads together to come up with what we now call the Julian calendar,which includes 12 months,365 days,and an additional “leap day” every four years on February 29.
4年等于1460天,4年等于35040钟,4年等于2102400分,4年等于126144000秒。解:已知1年=12个月、1年=365天、1天=24小时、1小时=60分钟、1分钟=
But rounding 0.2421 up to 0.25 each year created an issue,because it didn’t quite add up to a full day every four years—and that tiny discrepancy meant that after 128 years,the calendar year ended up starting a day before Earth had completed its rotation around the sun. By the 14th century,the calendar year was starting a whopping 10 days before Earth finished its orbit.
一年一般是365天。所以,4年乘以365天就可以得出天数,就是1460天了。(4х365=
但是把每年的0.2421天约等于0.25天也产生了一个问题,因为按照0.2421算的话,每四年要增加的并不是一整天。这个微小的差额意味着128年后,年历就会在地球完成公转前一天开始。到了14世纪,年历开始的时间比地球完成公转的时间早了10天之多。
In 1582,Pope Gregory XIII sought to correct the error by suggesting that we simply skip a leap day every so often. His Gregorian calendar,which we still use today,mandates that we omit the leap day during years evenly divisible by 100 but not by 400. For instance,the year 2000 included a leap day because it’s divisible by 100 and 400; the year 2100,on the other hand,will not include a leap day,since it’s evenly divisible by 100,but not by 400.
四年是多少月多少天多少小时多少分钟多少秒4年等于48个月,4年等于1460天,4年等于35040钟,4年等于2102400分,4年等于126144000秒。解:已知1年=12个月、1年=365天、1天=24小时、1小时=60分钟、1分钟=
1582年,教皇格列高利十三世想要改正这一错误,于是建议我们时不时跳过一个闰日。他的格里历(我们今天仍在使用的公历)规定,在能够被100整除但不能被400整除的年份跳过闰日。举例来说,2000年有一个闰日,因为2000能被100和400整除;而2100年没有闰日,因为它能被100整除,但不能被400整除。
教皇格列高利十三世对恺撒大帝过度校正的更正本身是一种校正不足,所以大约1万年后,我们将很可能需要对我们的闰日规则进行重新评估。
英文来源:Mental Floss
每四年中有一个闰年,闰年是366天,而每四年中有三个平年,平年是365天一个,那么就能所出:四年就等于366+365+365+365=1461天,所以四年就等于
翻译&编辑:丹妮