关于月相 Lunar phase
中秋临近，从维基百科了解了一些月相的知识。[attach]871[/attach]
The lunar phase depends on the Moon's position in orbit around the Earth, and the Earth's position in orbit around the sun. This diagram looks down on Earth from north. Earth's rotation and the Moon's orbit are both counter-clockwise here. Sunlight is coming in from the right, as indicated by the yellow arrows. From this diagram we can see, for example, that the full moon will always rise at sunset, and that the waning crescent moon is high overhead around 9:00 AM local time.
月相由两个因素决定，月亮绕地球的轨道的位置和地球绕太阳轨道的位置。上面的图是从太空向下看北半球。地球的自转和月亮的绕行都是逆时针方向。阳光从右边过来，图中用黄色箭头指示。从图中可以看出，满月总是在日落之后升起，亏月在本地时间的早上九点左右刚好在头顶。 [attach]872[/attach]
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