在暗影边缘
(原标题: At the Shadow's Edge)
2021-11-25
浏览次数: 35
地球中央的阴影或本影的形状像一个锥体逐渐变细，呈圆形横截面。但在月球轨道的距离上，它比月球宽。但在11月18日/19日的月食期间，月球的一部分仍然在本影之外。这张连续的照片是由5张几乎月全食的照片合成的，拍摄时间约为1.5小时。该系列对准了部分横截面的圆弧，中央图像在最大日食。它显示了在阴影弯曲的边缘之外，有一个明亮而薄的月盘。当然，即使在阴影中，月球表面也不是完全黑暗的，反射出被地球大气层散射到阴影中的过滤阳光的红色色调。值得注意的APOD提交：2021年11月19日的月食
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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
© Jean-Francois Gout