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    Re: Quiz about the Southern Cross
    From: Robin Stuart
    Date: 2017 Sep 24, 05:51 -0700

    I think there’s a bit more nuance in Kermit’s question than there appears at first sight. As Garry points out south of 33°S Gacrux, the northern most star in the cross, is circumpolar and perpetually above the horizon. But beyond 67°S you need to contend with the midnight Sun. South of 27°N Acrux, the southernmost and brightest star in the cross just rises above the horizon and ignoring atmospheric extinction the full cross will be visible but only when it culminates in the hours of darkness. The answer lies somewhere between 27°N and 67°S.

    Robin Stuart

       
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