（2） 大距(greatest elongation)： 内行星在绕日运行时， 当行星、 地球和太阳三颗星所成的角距最大时叫「大 距， 行星在太阳东侧叫东大距， 在西侧叫西大距...
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By the time it arrives at its greatest elongation, it will appear roughly half-illuminated and the amount of its surface illuminated by the Sun will continue to decrease in the days to come.
在它到达最大距角(elongation)时，它将看上去大概为半明亮、被太阳照明的部分将在持续日子里减少。
At greatest eastern elongation, Mercury swings farthest east of the sun, and briefly appears as an evening "star" after sunset.
这是水星是最大程度的在太阳东部的延伸，这是今晚日落后最简短的一次显示。
Mercury - the solar system's innermost planet - is at its greatest eastern elongation today.
水星——太阳系最里面的行星—今天是东部最大的延伸。
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