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What are the lunar phases?The full moon is one of eight phases in the Moon’s roughly 29.5-day orbit around Earth. Each phase shows a different amount of the Moon’s surface lit by the Sun as seen from our perspective. Because we always see the same side of the Moon, the changing angle of sunlight makes it appear full, half-lit, or nearly dark at different points in its cycle.，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述