... apparent size ==> 表观尺寸,视尺寸 apparent sky brightness ==> 视天空亮度 apparent slip ==> 视断距 ...
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Aside from the sheer novelty of it, such observations are useful in gauging the apparent sky brightness and transparency during totality.
暂且不说它有多么地新奇，全食时的这种观测，在精确计量视天空亮度和透明度时也是很有用的。
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