为血月做好准备(Get ready for the blood moon)

如果你足够幸运，今晚能在万里无云的天空下发现自己，你将能够看到我们太阳系的一大奇迹，月全食，也被称为“血月”这个令人毛骨悚然的绰号源于当地球把它的影子投射到月球上时，月球呈现出的微红色。这里的特色是瑞士阿尔卑斯山上的血月。当地球和月球与太阳完全对齐，月球直接落在地球阴影后面时，就会发生月全食。当地球落在月球的阴影后面时，就会发生日食。
原文：
If you’re lucky enough to find yourself under a cloudless sky tonight, you'll be able to see one of our solar system’s great wonders, a full lunar eclipse, also known as a ‘blood moon.’ The spooky nickname derives from the reddish hue the moon takes on when Earth casts its shadow upon it. Featured here is a blood moon over the Swiss Alps. A full lunar eclipse occurs when the Earth and moon align perfectly with the sun, and the moon falls directly behind Earth’s shadow. When Earth falls behind the Moon’s shadow, a solar eclipse occurs.
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