Also abbreviated AU. A unit of distance measurement equal to the semimajor axis of the Earth's elliptical orbit, equivalent to the average of the maximum and minimum distances between Earth and the Sun.
1 astronomical unit (150,000,000 km; 93,000,000 mi).
- Williams, D.; Davies, R. D. (1968), "A radio method for determining the astronomical unit", Monthly Notices of the Royal Astronomical Society 140 (4): 537, doi:10.1093/mnras/140.4.537
- The IAU and astronomical units
- Recommendations concerning Units (HTML version of the IAU Style Manual)
- Chasing Venus, Observing the Transits of Venus
- Transit of Venus
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