Füsikaalisk ianhaid
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Nööm |
Kwadrootgraad
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Ianhaidentiaken
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, ,
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Füsikaalisk grate
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Rümwinkel
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Formeltiaken
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Dimension
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Uun SI-ianhaiden
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At kwadrootgraad (deg², (°)²) (ingelsk square degree of sq degree) as en ianhaid för di rümwinkel. Hat woort brükt uun a astronomii för't ütjmeeden faan objekten üüb a stäärhemel.
Letjer ianhaiden san:
- Kwadroot-böögminüüt (ingelsk square arcmin)
kwadrootgraad
- Kwadroot-böögsekund (ingelsk square arcsec)
kwadrootminüüten
kwadrootgraad.
Di fol rümwinkel as
sr =
.
Amreegnang tu steradiant:
![{\displaystyle {\begin{aligned}\Leftrightarrow 1\ \mathrm {deg} ^{2}&=\left({\frac {2\pi }{360}}\right)^{2}\ \mathrm {sr} \\&=\left({\frac {\pi }{180}}\right)^{2}\ \mathrm {sr} \\&={\frac {\pi ^{2}}{32\,400}}\ \mathrm {sr} \\&\approx 3{,}0461741\cdot 10^{-4}\ \mathrm {sr} \\&\approx 0{,}00030461741\ \mathrm {sr} \end{aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/6d32aec11cf8de7dc03fd16ba268ebc2a7bbeebe)
of
![{\displaystyle \Leftrightarrow 1\ \mathrm {sr} \approx 3283\ \mathrm {deg} ^{2}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/01655c9ef8c97bfc3447db8b94e90c4d4f366634)
För letjer winkel san rümwinkel bal lik üs en areaal, do as en objekt mä en winkel faan 1 graad mool 1 graad amanbi = 1 kwadrootgraad.