地球的本影
(原标题: The Umbra of Earth)
2025-09-11
浏览次数: 1504
地球内部的黑暗阴影被称为本影。它的形状像一个锥体延伸到太空中，在月食期间最容易看到它的圆形横截面。在9月7日至8日的晚上，满月经过地球本影锥的中心附近，在我们美丽的星球上的大部分地区，包括南极洲、澳大利亚、亚洲、欧洲和非洲的部分地区，日食观察者都很开心。在中国张家口市拍摄的这张延时合成图像，使用了从左到右连续拍摄的月全食照片，揭示了在月球上滑动的本影的弯曲截面。阳光被大气层散射到地球的本影中，导致月球表面在全食期间呈现红色。但在靠近本影边缘的地方，月食的边缘呈现出明显的蓝色。蓝色的月食来自于太阳光穿过平流层上层的高层，臭氧使红光散射，蓝光透射。在这次悠闲的月食的总阶段，月球完全在地球的本影内大约有83分钟。
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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.
© Wang Letian