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    Winter solstice: things you should know about the shortest day of the year

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    2017-12-22 14:55China Daily Editor: Yao Lan ECNS App Download

    你知道這些冬至科普小知識嗎?全國人民冬至又都在吃啥?

    Winter solstice: things you should know about the shortest day of the year

    在冬至這一天,北半球白晝最短,夜晚最長.南半球正相反.

    美國哥倫比亞廣播新聞邀請馬薩諸塞大學天文學家史蒂芬•施奈德解釋冬至的天文學成因,他向我們解答了大家需要知道的六個基本的冬至小知識.

    What is the winter solstice, and why do we have it?

    什么是冬至?為什么有冬至這個節氣?

    "Earth's axis is tilted 23.5 degrees relative to its orbit, and on December 21, Earth will be at the point in its orbit when the North Pole is tilted at its maximum away from the sun," Schneider told CBS News. "The effect of this in the Arctic is completely in darkness as Earth spins that day."

    施奈德說:"地軸相對于自轉軌道的傾角為23.5度.12月21日,地球的北極距離太陽最遠.這會導致當天北極圈地區完全見不到太陽."

    For those of us in the Northern Hemisphere, it's the day with the shortest amount of daylight — less than 12 hours — and our longest night of the year. However, that's not the case for everyone. While it's winter for those of us in the Northern Hemisphere, people in the Southern Hemisphere experience it as their summer solstice with the longest stretch of daylight.

    對北半球的人們來說,冬至這一天白晝最短,不到12小時,夜晚最長.但并不是對所有人都這樣.北半球經歷寒冬時,南半球在這一天迎來白晝最長的夏至日.

    When does the winter solstice occur?

    冬至在哪天?

    The Earth's North Pole will be tilted farthest from the sun at 11:27 am ET on Thursday, Dec. 21, 2017, according to the National Weather Service.

    根據美國國家氣象局的數據,今年的冬至發生在美國東部時間2017年12月21日上午11點27分(北京時間2017年12月22日零點27分),此時北極距離太陽最遠.

    Why isn't the winter solstice on the same day each year?

    為什么每年的冬至都不是同一天?

    The date of the winter solstice varies from year to year for people in different time zones. It typically occurs around Dec. 21 or 22, though on rare occasions it can be as early as Dec. 20 or as late as Dec. 23, according to the Weather Channel.

    根據天氣頻道的數據,對不同時區的人們來說,冬至的日期每年會有變化.多數年份的冬至日都在12月21日或者22日,偶爾提早到20日,或者錯后到23日.

    That's because our calendars aren't a precise match to the solar year.

    這是因為日歷與陽歷并非完全吻合.

    Schneider writes: "Earth takes about 365 1/4 days to orbit the Sun. Next year, the moment of the solstice will be about 6 hours later at 5:23 pm ET. In 2019, it will be at 11:19 pm ET, so for people living in Puerto Rico and other time zones to the east, the date of the solstice will be on the 22nd."

    施奈德寫道:"地球圍繞太陽公轉周期為365又1/4天.明年的冬至比今年大約遲6個小時(美國東部時間下午5點23分),后年又推后到美國東部時間晚上11點19分.所以對于居住在波多黎各及以東時區的人們來說,冬至日期是22日."

      

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