大陵五，英仙座β星，西名Algol，意思是“妖魔”，它是英仙座内一颗明亮的恒星，也是一对著名的食双星。
大陵五的亮度变化的原因不是由于星体物质特殊。
Algol's brightness variations are not due to some special quality of a single star.
早期的天文学家没有方法得知为何大陵五的亮度会发生变化。
Early stargazers had no way to know why Algol varied in brightness.
像大陵五、毕宿五和牧夫座这些天体的名字依然保留了阿拉伯人征服天空的痕迹。
The names of such stars as Algol, Aldebaran and Bootes preserve the traces of Arab conquests in the sky.
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