秒差距
秒差距（英语：parsec，符号为pc）是一个宇宙距离尺度，用以测量太阳系以外天体个长度单位。1秒差距定义为某一天体搭1天文单位个对角为1角秒时个距离，但于2015年时被重新定义为一个精确值，为648000/π天文单位。
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