月相 [
yuè xiàng]
[天] phase of the moon
- 自从史前的年代,人们就开始通过月相观察月球的盈亏。
Since prehistoric times, people have watched the moon waxing and waning through its phases. - 其规律性的月相使之成为一种非常方便的计时器,很多古老日历的发明都源自对月圆月缺变化的观察。
Its regular phases make the moon a very convenient timepiece, and the periods of its waxing and waning form the basis of many of the oldest calendars. - 从水星的角度,地球和她相当大的月球看起来总是两个反射太阳光的小圆盘,从来不会出现类似月相的变化。
From Mercury, both the Earth and its comparatively large moon will always appear as small circles of reflected sunlight and will never show a crescent phase.
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