Top > 宇宙関係の単位
光年光が1年に進む距離、約9.46x10^12km
AU (Astronomical unit)天文単位、地球が太陽の周りを回る楕円軌道の長半径、約1.5x10^9km

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Last-modified: Fri, 08 Sep 2006 00:08:27 JST (4794d)