greatest eastern elongation

基本解釋

Mercury – the solar system's innermost planet – is at its greatest eastern elongation today.
水星——太陽系最里面的行星—今天是東部最大的延伸。
At greatest eastern elongation, Mercury swings farthest east of the sun, and briefly appears as an evening "star" after sunset.
這是水星是最大程度的在太陽東部的延伸，這是今晚日落后最簡(jiǎn)短的一次顯示。
Don't tarry when looking for Mercury. Even at its greatest eastern elongation, Mercury sets less than 1.5 hours after the sun tonight.
在尋找水星的時(shí)候，無須駐足等候。即便處在東大距，日落之后不到1個(gè)半小時(shí)，水星便下沉了。