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URLエンコード(UTF-8) : コピー
R%E2%98%89

数値文字参照(10進数) : コピー
R☉

数値文字参照(16進数) : コピー
R☉

R☉の説明

Translingual Alternative forms The R is not always italic. Etymology R (radius) and subindex ☉ (sun). Symbol R☉ (astronomy) solar radius: a unit of distance, equal to the radius of the sun: 7×108 m or 110 R🜨. The inner edge of the [circumbinary] disc is at 317 R☉, well outside the inner binary orbit. The radius of the sun specifically Usage notes R☉ may be distinguished from r☉, the latter not a unit of measurement but meaning radial distance from the sun (heliocentric distance). Unlike R☉, r☉ is used specifically for our sun; for another star, r＊ or r✶ is likely to be used.

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 R ⊙ = 6.957 × 10 8 m {\displaystyle 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.

Unicode検索結果 - R☉