The solar radius is approximately 695,500 kilometres (432,450 miles) or about 110 times the radius of the Earth, or 10 times the average radius of Jupiter. It varies slightly from pole to equator due to its rotation, which induces an oblateness of order 10 parts per million. See 1 gigametre for similar distances.
The SOHO spacecraft was used to measure the diameter of the Sun by timing transits of Mercury across the surface during 2003 and 2006. The result was a measured radius of 696,342 ± 65 kilometres (432,687 ± 40 miles).
See also 
- Emilio, Marcelo; Kuhn, Jeff R.; Bush, Rock I.; Scholl, Isabelle F., "Measuring the Solar Radius from Space during the 2003 and 2006 Mercury Transits", arXiv, retrieved 2012-03-28
- S. C. Tripathy, H. M. Antia (1999). "Influence of surface layers on the seismic estimate of the solar radius". Solar Physics 186 (1/2): 1–11. Bibcode:1999SoPh..186....1T. doi:10.1023/A:1005116830445.
- T. M. Brown, J. Christensen-Dalsgaard (1998). "Accurate Determination of the Solar Photospheric Radius". Astrophysical Journal Letters 500 (2): L195. arXiv:astro-ph/9803131. Bibcode:1998ApJ...500L.195B. doi:10.1086/311416.