美国国家航空航天局NASA每日一图-2017年6月21日

Visualization of the August 21, 2017 Total Solar Eclipse

On August 21, 2017, the Earth will cross the shadow of the moon, creating a total solar eclipse. Eclipses happen about every six months, but this one is special. For the first time in almost 40 years, the path of the moon's shadow passes through the continental United States. This visualization shows the Earth, moon, and sun at 17:05:40 UTC during the eclipse.

In the animation from which this still was taken, the Earth, moon, sun, and shadow cones are viewed through a telescopic lens on a virtual camera located far behind the Earth. Long focal lengths like the one used here appear to compress the distance between near and far objects. Despite appearances, the geometry of the scene is correct. The moon's umbra cone is roughly 30 Earth diameters long, barely enough to reach the Earth, while the sun is almost 400 times farther away.

More from NASA's Scientific Visualization Studio: 2017 Eclipse State Maps, 2017 Total Solar Eclipse in the U.S.

Image Credit: NASA's Scientific Visualization Studio

Last Updated: June 21, 2017
Editor: Sarah Loff

2017年8月21日的可视化总日照

2017年8月21日,地球将越过月球的阴影,造成全日食。日食每六个月发生一次,但这是特别的。近40年来,月球影子的路径经过美国大陆。这个可视化在日食时间17:05:40 UTC显示地球,月亮和太阳。

在仍然被拍摄的动画中,地球,月球,太阳和影子锥体通过位于远离地球的虚拟相机上的望远镜头观看。像这里使用的长焦距似乎可以压缩近距离和远距离物体之间的距离。尽管出现,场景的几何是正确的。月球的大圆锥体大约是30个地球直径长,几乎不足以到达地球,而太阳几乎是400倍远的地方。

美国宇航局科学可视化工作室的更多内容:2017年Eclipse State Maps,2017年美国的日食总量

图片来源:美国宇航局科学可视化工作室

最后更新:2017年6月21日
编辑:莎拉·洛夫

 

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