Solar radius

Conversion of nominal solar radius
1 `R`_☉ =	Units
6.95700×10⁸	metres
695,700	kilometres
0.00465047	astronomical unit
432,288	miles
7.35355×10⁻⁸	light-year
2.25461×10⁻⁸	parsec
2.32061	light-seconds

Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. The solar radius is usually defined as the radius to the layer in the Sun's photosphere where the optical depth equals 2/3:^[1]

$1\,R_{\odot }=6.957\times 10^{8}{\hbox{ m}}$

695,700 kilometres (432,300 miles) is approximately 10 times the average radius of Jupiter, 109 times the radius of the Earth, and 1/215th of an astronomical unit, the approximate distance between Earth and the Sun. The solar radius to either pole and that to the equator differ slightly due to the Sun's rotation, which induces an oblateness in the order of 10 parts per million.^[2]

^ Cite error: The named reference Hab2008 was invoked but never defined (see the help page).
^ "NASA RHESSI oblateness measurements 2012". Archived from the original on 2018-09-17. Retrieved 2017-07-12.

[Hab2008-1] Cite error: The named reference Hab2008 was invoked but never defined (see the help page).

[2] "NASA RHESSI oblateness measurements 2012". Archived from the original on 2018-09-17. Retrieved 2017-07-12.

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