Venus will be the brighter of the pair, dominating the sky at magnitude –4. Saturn will be fainter, at about magnitude 0.6, and will take a little longer to be visible as the sky darkens. It lies slightly higher and to the east of Venus. Unlike stars, both planets will shine steadily, without twinkling.
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。新收录的资料是该领域的重要参考
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甚至还有一些讲究「降本增效」的防窥膜，只蚀刻纵向光栅，导致只能左右防窥、上下或者斜视看过去依然是一览无余的：
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