Copyright:Wang Letian
中文翻譯:
在我們的地球上，有一個神秘的地方叫做umbra，它的形狀就像一個指向太空的圓錐。當滿月出現在umbra的中心時，這就像是在天上的一個特別表演，很多人都聚集在一起觀賞。就在九月七日和八日的晚上，滿月經過了umbra的心臟，讓來自南極洲、澳洲、亞洲、歐洲和非洲的朋友們都能看到這一幕。我們可以從中國的張家口市看到一張特別的照片，這張照片好像在告訴我們，umbra的陰影是如何慢慢地滑過月亮的。在這個神奇的時刻，陽光在地球的氣氛中轉變，使得月亮看起來變成了紅色。而在umbra的邊緣，月亮的一部分有著特別的藍色光芒，這是因為陽光透過高空的臭氧層，散射了紅光，只留下了藍光。在這次悠閒的月全食中，月亮整整在umbra裡待了83分鐘呢！
原文:
The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. And on the night of September 7/8 the Full Moon passed near the center of Earth’s umbral cone, entertaining eclipse watchers around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa. Recorded from Zhangjiakou City, China, this timelapse composite image uses successive pictures from the total lunar eclipse, progressing left to right, to reveal the curved cross-section of the umbral shadow sliding across the Moon. Sunlight scattered by the atmosphere into Earth’s umbra causes the lunar surface to appear reddened during totality. But close to the umbra’s edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight originates as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue. In the total phase of this leisurely lunar eclipse, the Moon was completely within the Earth’s umbra for about 83 minutes.
來源:NASA每日圖片
