在地球影子的边缘

2021年11月25日

At the Shadow’s Edge
Image Credit & Copyright: Jean-Francois Gout

Explanation: Shaped like a cone tapering into space, the Earth’s dark central shadow or umbra has a circular cross-section. It’s wider than the Moon at the distance of the Moon’s orbit though. But during the lunar eclipse of November 18/19, part of the Moon remained just outside the umbral shadow. The successive pictures in this composite of 5 images from that almost total lunar eclipse were taken over a period of about 1.5 hours. The series is aligned to trace part of the cross-section’s circular arc, with the central image at maximum eclipse. It shows a bright, thin sliver of the lunar disk still beyond the shadow’s curved edge. Of course, even within the shadow the Moon’s surface is not completely dark, reflecting the reddish hues of filtered sunlight scattered into the shadow by Earth’s atmosphere.

Notable APOD Submissions: Lunar Eclipse of 2021 November 19

Tomorrow’s picture: pixels in space

在地球影子的边缘
影像提供与版权: Jean-Francois Gout

说明: 地球暗影黝黑的中心区（本影），形似伸入太空、具有圆形截面的圆锥。它在月球轨道处的宽度比月亮大。不过在11月18/19日那晚的月食发生时，部分的月盘并未进入地球的本影之内。就如这幅由摄于1.5小时期间，记录这例接近月全食事件的5张照片组合而成之主题影像所示。这幅叠合的系列影像，呈现了地球暗影圆形截面的圆弧边缘，最中间的那张则摄于食甚之时。当时仍有一抹银白的月盘，留在暗影的圆弧边缘之外头。很明显的，位在地球暗影之内的月面也不是完全黝黑的，而是受到渗入地球夜面大气的红化阳光之照耀。

提交给APOD的值得注意的照片: 2021年11月19日的月食

明日的图片: pixels in space