Astronomical unit

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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.

An astronomical unit (abbreviated as AU, au, a.u., or ua) is a unit of length equal to exactly Plantilla:Nowrap or approximately the mean EarthSun distance.

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