Placeholder Image

字幕列表 影片播放

  • On August 21, 2017

    2017 年 8 月 21 日

  • the shadow of the Moon will pass

    月亮的陰影會橫掃美國

  • from the west coast to the east coast of the U.S.

    從西岸到東岸

  • Our blue sky will turn black as night

    我們的藍天會變得像晚上一樣黑

  • and fill with stars,

    還會有滿天星斗

  • and there will be a hole in the sky

    同時天空中也會出現一個洞

  • where the Sun used to be,

    就是太陽之前的位置

  • surrounded by the fiery ring of the Sun's corona,

    會被日冕形成的火環所圍繞

  • a total eclipse of the Sun.

    這就是日全食

  • This will truly be a historic event.

    這將會是一個歷史性事件

  • Accounts of solar eclipses

    關於日食的紀錄

  • date way back on the written record.

    可以追溯回古時史書

  • The early Mesopotamians wrote

    早期的美索不達米亞人寫道:

  • that the Sun was put to shame

    太陽蒙羞了

  • during the solar eclipse of the 14th century B.C.E.

    西元前第十四世紀的一場日食

  • and it may have started

    可能是導致

  • the Sun worship of the Egyptian pharaoh Akhenaten.

    埃及法老阿肯那頓太陽膜拜的開端

  • Ancient Chinese astrologers paid with their lives

    古代的中國占星術士如果漏報了日食

  • if they failed to predict the solar eclipse

    或無法預示皇帝的命兆

  • and portend the fate of their emperors

    是要賠上性命的

  • whose symbol was the Sun.

    因為太陽就是皇帝的象徵

  • The earliest date of a specific event in human history,

    人類史上最早記載日期的特定事件

  • a battle between the armies of Lydia and Media,

    為利底亞與米底亞之間的戰爭

  • occurred on May 28, 535 B.C.E.

    發生於西元前 535 年 5 月 28 日

  • when a solar eclipse caused the soldiers

    當時發生的日食造成

  • to lay down their arms and declare a truce.

    士兵棄械並宣告停戰

  • So how does it happen?

    那日食是怎麼形成的?

  • During a total solar eclipse,

    當日全食發生時

  • the Moon moves between the Earth and the Sun.

    月球運行到地球與太陽之間

  • When this happens, the disc of the Moon

    而且月球的盤面

  • appears to perfectly cover the disc of the Sun

    看起來完全擋住太陽

  • even though the Sun is much larger than the Moon.

    即使太陽比月球大很多

  • But how is this possible?

    但這怎麼可能?

  • The Sun is 400 times bigger than the Moon,

    太陽比月球大了 400 倍

  • but by sheer coincidence,

    但是就有這麼巧

  • the Moon is 390 times closer to Earth.

    月球到地球的距離 比日地距離近 390 倍

  • Size and distance cancel each other out

    尺寸及距離的效應互相抵銷

  • so that the Moon and Sun appear

    因此月球與太陽看起來

  • to be almost the exactly same size.

    大小幾乎相同

  • Every time the Moon orbits the Earth,

    每次月球繞地球公轉

  • once every 27.3 days,

    一圈 27.3 天

  • it has to pass between the Earth and the Sun,

    它總會穿過地球與太陽之間一次

  • a stage called the new moon phase.

    這時期稱做新月(朔)

  • And every time it passes,

    每次它穿過

  • the New Moon has a chance to block out the Sun.

    新月就有機會擋住太陽

  • Most of the time,

    大部分的時間

  • the Moon passes a little above

    月球穿過的位置

  • or a little below the Sun,

    可能比太陽高一點或低一點

  • but if they align perfectly,

    但如果它們完全對齊

  • the shadow of the Moon

    月球的陰影

  • will make a narrow path across Earth

    就會在地球上掃出一條狹長的食帶

  • and those in the shadows will see a total solar eclipse.

    只有在食帶中的人才能看到日全食

  • Just like on night side of the Earth,

    就像地球在夜晚那側一般

  • the sky during a total eclipse is black

    天空在日全食期間是黑暗的

  • and filled with stars.

    並可見滿天星斗

  • But while the moon perfectly covers

    但是就算月球完全遮蓋

  • the surface of the Sun,

    太陽的表面

  • it doesn't block out the Sun's outer atmosphere,

    它也擋不住太陽的大氣層

  • its corona, which appears as a fiery ring

    即日冕,看起來就像一圈火環

  • around the dark disc of the moon.

    在月球暗影的外圍

  • Solar eclipses occur several times a year,

    一年會發生好幾次日食

  • but most often they are partial eclipses

    但多數情況是日偏食

  • where the Moon doesn't quite line up with the Sun.

    也就是月球與太陽並非完全對齊

  • And, when the Moon and Sun are perfectly aligned,

    再者,有時月球與太陽排成一直線時

  • the Moon is usually too far from Earth in its orbit

    月球在公轉軌道上的位置 離地球太遠

  • to completely cover the Sun,

    無法完全遮蓋太陽

  • creating an annular eclipse.

    就會發生日環食

  • During an annular or partial eclipse,

    在日環食或日偏食發生時

  • the sky remains bright.

    天空依然明亮

  • Even on those rare occasions of a total eclipse,

    即使是很罕見的日全食

  • the Moon's shadow is most likely to fall

    月球的陰影最有可能落在

  • on the 70% of Earth that is covered by water,

    佔地球 70% 的海面上

  • and few people, if any, will see it.

    所以只有極少數人有幸能見到此奇景

  • The eclipse of 2017 will be remarkable on a larger scale

    2017 年的日食很值得注意, 因為長久來看

  • because the Moon is slowly moving away from Earth.

    月球正逐漸遠離地球

  • If a furry ancestor of ours had bothered to look up

    如果我們有著毛皮的祖先願意費神

  • during a solar eclipse a hundred million years ago,

    在幾億年前的一場日食中抬頭仰望

  • it wouldn't have seen the fiery corona of the Sun.

    他不會看到太陽的日冕火環

  • It would have just been dark.

    只有一片漆黑

  • Eventually, the Moon will have moved too far from Earth

    總有一天,月球會因離地球太遠

  • to completely cover the disc of the Sun.

    再也無法完全遮蔽太陽

  • It is only during our little wink of Earth's history

    只有在地球歷史上這段 轉瞬般短暫的時間內

  • that the Moon is at just the right distance

    月球位在恰好的距離

  • to cause a total solar eclipse

    能造成日全食

  • yet not block the Sun's corona.

    卻不會擋住日冕

  • So on August 21, 2017,

    所以在 2017 年 8 月 21 日

  • when the Moon exactly lines up with the Sun

    當月球與太陽恰恰形成一直線

  • and the Moon is close enough to the Earth,

    而且月球與地球的距離夠近

  • its shadow will cross the U.S.

    它的暗影才會橫掃美國

  • and, if you happen to be in its narrow path,

    如果你剛好位在月影的狹長食帶上

  • you will witness one of the most

    你將會見證一場

  • awe-inspiring sights in the universe.

    宇宙間最令人敬畏的景象

  • But, as incredible as this event will be,

    但是,就像這起事件非常奇妙

  • total eclipses are one of the most dangerous as well.

    日全食也非常危險

  • Only specially tinted filters,

    只有專為觀察太陽而設計的

  • specifically designed to observe the Sun,

    特殊染色濾鏡

  • should be used.

    能拿來看日食

  • The eclipse might put the Sun to shame,

    日食可能使太陽蒙羞了

  • but even a shamed Sun

    但是即使是蒙羞的太陽

  • can seriously damage your eyes.

    也能嚴重傷害你的眼睛

On August 21, 2017

2017 年 8 月 21 日

字幕與單字

影片操作 你可以在這邊進行「影片」的調整,以及「字幕」的顯示

B1 中級 中文 TED-Ed 月球 太陽 日食 地球 新月

TED-Ed】罕見壯觀的日全食--安迪-科恩。 (【TED-Ed】A rare, spectacular total eclipse of the sun - Andy Cohen)

  • 981 90
    稲葉白兎 發佈於 2021 年 01 月 14 日
影片單字