天文距离单位是一个长度的单位，约等于地球跟太阳的平均距离。
... 天文精密计时仪 wrist chronometer 天文距离 astronomical distance 天文年表 astronomical chronology ...
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天文距离单位 Astronomical Unit
天文单位距离 astronomical unit distance
距离天文馆 Tenmonkan
天文单位距离的光行时 light-time for astronomical unit distance
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。
But here we come up against the most difficult of all obstacles to contact with people on other planets — the astronomical distances which separate us.
为了度量天文距离，人们把光在一年中走过的距离当作一个距离单位。
To measure astronomic distances one takes as a unit that distance which light travels in a year.
但是据npr新闻的乔·帕尔卡报道，谈及天文距离时，“接近”是一个相对的说法。
But as NPR's Joe Palca reports close is a relative term when it comes to astronomical distance.
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