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吉秒差距,天文长度单位,缩写为Gpc百万秒差距(Mpc)千秒差距(kpc)1秒差距(pc)天文单位(AU)
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1秒差距(pc)=3.2616光年=206265天文单位=308568亿千米1千秒差距(kpc)=1000秒差距1百万秒差距(Mpc)=1000000秒差距=1000千秒差距1吉秒差距(Gpc)=1000百万秒差距(Mpc)=1000000千秒差距(kpc)=秒差距(pc),约等于308568亿亿千米。
m(米)km(千米)
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这些速度单位代表多快的速度?c就是光速是吧?AU/sec是每秒一光天吗?pc/sec是什么?1pc/sec××1000=kpc/sec×=Mpc/sec×1000=1Gpc/sec?
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这些是距离单位,不是速度单位.AU/sec表示在地球公转轨道半长径的两个端点看来1角秒的视差所对应的天体距离,称为秒差距(Parsec),缩写为pc,1pc=1AU/sec=3.2616光年.AU为天文单位,表示日地平均距离,1AU等于地球公转轨道半长径;sec是second(秒)的缩写,这里是角度单位.理论上可以类似于AU/sec来定义pc/sec,也就是长度为1pc的直线段两个端点看来1角秒的视差对应的距离,1pc/sec=672760光年=6.千米.但是pc这个单位太大,用pc作为基准来测量1角秒的视差是无法做到的.
你说的好复杂,我有些看不明白,1角秒的视差是什么?我是在SpaceEngine 0.9.7.1这个软件看到的这些单位
1角秒等于1度的3600分之一。所谓视差,举个例子,当你在某一位置看远处的物体,比如正北边的一棵树,当你沿东西方向走动到另一位置时,你会发现那棵大树已经偏离了正北方,那个偏离正北方的角度就是所谓的视差,准确说是那棵大树相对于你刚才走动前后的那两个位置的视差。
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