namlow 发表于 2015-1-18 22:27:25

晓风残月新解

晓风残月新解

A waning crescent moon is sometimes called an old moon. It’s seen in the east before dawn.
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https://scontent-b-sin.xx.fbcdn.net/hphotos-xap1/v/t1.0-9/q83/p160x160/10922808_4964481246012_5598277943083442341_n.jpg?oh=ef79493632111f22ffe567ceea73506f&oe=555ED3A1
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Nam Low http://upload.wikimedia.org/.../Orbit_of_the_Moon_in_2013...
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Nam Low Because of the difficulty of seeing it in this phase, observations of thin crescent Moons visible only before sunrise count more than any other type of observation.









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