地影沉落（你也可以试着观察下）

                               
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Shadow Set
Credit: J. Bonnell, A. Kutyrev, J. Norris, R. Canterna, WIRO
Explanation: A nearly full Moon and planet Earth's shadow set together in this scene captured Monday from snowy Mt. Jelm, home of the Wyoming Infrared Observatory. For early morning risers (and late to bed astronomers), shadow set in the western sky is a daily apparition whose subtle beauty is often overlooked in favor of the more colorful eastern horizon. Extending through the dense atmosphere, Earth's setting shadow is seen in this picture as a dark blue band along the distant horizon, bounded above by a pinkish glow or antitwilight arch. Also known as the Belt of Venus, the arch's lovely color is due to backscattering of reddened light from the rising Sun. The setting Moon's light is also reddened by the long sight-line through the atmosphere and echoes the dawn sky's yellow-orange hues.

沙发沙发^^
不错 :mrgreen:

什么意思不太懂?

同问
[quote:9d43b99d1d="rjxie"]

                               
登录/注册后可看大图

Shadow Set
Credit: J. Bonnell, A. Kutyrev, J. Norris, R. Canterna, WIRO
Explanation: A nearly full Moon and planet Earth's shadow set together in this scene captured Monday from snowy Mt. Jelm, home of the Wyoming Infrared Observatory. For early morning risers (and late to bed astronomers), shadow set in the western sky is a daily apparition whose subtle beauty is often overlooked in favor of the more colorful eastern horizon. Extending through the dense atmosphere, Earth's setting shadow is seen in this picture as a dark blue band along the distant horizon, bounded above by a pinkish glow or antitwilight arch. Also known as the Belt of Venus, the arch's lovely color is due to backscattering of reddened light from the rising Sun. The setting Moon's light is also reddened by the long sight-line through the atmosphere and echoes the dawn sky's yellow-orange hues.[/quote]

那是月亮？

^^ 地影，顾名思义就是地球的影子，我们看到的地影是地球影子在大气中散射时的景象。日出前地影和周围被地球大气折射的太阳光照亮的大气形成反差，所以才能看到。看图解。horizon是地平线，shadow是地影。

明白！

天文爱好者学英语的地方,牧夫天文论坛,支持英语文章! :mrgreen:

好厉害啊

~了解~了,呵呵

快把图装起来……
好图不能丢失！
^^