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How big is 秒差距?

31 petameetrit!

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秒差距

地球繞行太陽, 造成附近恆星看起來相對於遙遠天體在移動, 稱作視差. 當此鄰近恆星剛好 垂直於太陽系時, 視差就是一角秒(1/3600 度), 而此星就是一秒差距遠(約 3.26 光年). 視差(parallax)+角秒(arcsec)=秒差距(Parsec)

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Universumi ulatus > 秒差距

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