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 Earth–Sun distance.
- See also: Wikipedia
- Related: Orders of magnitude (length)
| The IAU and astronomical units The IAU and astronomical units www.iau.org/public_press/themes/measuring/ - Web |
| Recommendations concerning Units Recommendations concerning Units www.iau.org/Units.234.0.html - Web |
| Chasing Venus, Observing the Transits of Venus Chasing Venus, Observing the Transits of Venus www.sil.si.edu/exhibitions/chasing-venus/intro.htm - Web |
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| Transit of Venus Transit of Venus www.transitofvenus.org - Web |
