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au

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Transits of Venus across the face of the Sun were, for a long time, the best method of measuring the astronomical unit, despite the difficulties (here, the so-called "black drop effect") and the rarity of observations.

天文単位（au）とは？太陽系を測る基準となる距離の定義と歴史

天文単位au地球・太陽間距離天文学
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