↑ 收起筛选 ↑
试题详情

Today, February twenty-ninth, is leap day(闰日). This date only appears on the calendar once every four years. But why?

Everyone knows the Earth takes three hundred sixty-five days to travel around the sun. Well, that is not exactly correct. The Earth really takes three hundred sixty-five days, five hours, forty-eight minutes and forty-six seconds to complete its orbit around the sun.

The problem for people developing calendars was what to do with the extra five hours, forty-eight minutes and forty-six seconds.

People needed calendars to help them know when to plant crops and when to celebrate religious holidays. The ancient Greeks and Chinese had a solution. They produced calendars that included extra months every nineteen years.

The ancient Romans had a different solution. In the year forty-six, the Roman ruler Julius Caesar made a new calendar. The Julian calendar included an extra day every four years. But there was a problem. The Julian year was just over eleven minutes longer than the cycle of the seasons. In 1582, Pope Gregory the Thirteenth established a new calendar to keep a better recorder of the days. Pole Gregory was the religious leader of most of Europe. He decided that years that could be divided by four would add a day. However, years that ended in two zeros and that could not be evenly divided by four hundred would not be leap years. For example, the years 1700, 1800and 1900 were not leap years. But the years 1600 and 2000 were leap years

So leap years are years with three hundred sixty –six days , instead of the usual three hundred sixty –five.This extra days is added to the calendar on February twenty –ninth , sometimes known as leap day .People born on leap day may be called “leapings ”.They usually celebrate their birthday on February twenty –eight or March first .

Title:________1.________

Reasons

The Earth really takes 356days, 5hours,48minutes and 46seconds to complete its orbit around the sun.

__2.___is needed to benefit people’s daily life and work

__3.____

How to deal with the extra 5hours,48minutes and 46seconds

___4._____

__5._____

Ways

Ancient Greeks and Chinese

Producing ­________6.___every 19years

__7.______

Producing an extra day_8.__

The Pop Gregory VIII

Producing a leap day if the year could be divided _9.____.No leap day when the year ended in two zeros but could not be divided by 400.

Result

Leap day ___10.___and February twenty –ninth was added to the calendar

高三英语其他题中等难度题

少年,再来一题如何?
试题答案
试题解析
相关试题