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Hic Sunt Dracones: Why are there dragons on medieval astrolabes?

机译:HIC Sunt Dracones:为什么有中世纪的Astrolabes上有龙?

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One of the many delights of researching medieval astrolabes is that the star pointers on their retes are often zoomorphic. In particular, the two ends of its outer frame (the Capricornian ring) are sometimes fashioned as the head and tail of a dragon - see Fig. 1 for an example. Whilst the use of a dog's head as the pointer for the Dog star Sirius (αCMa, Alhabor), or birds for the Eagle Altair (α Aql) or the Raven Corvus (γ Crv, Algorab) are obviously intended as forms of a rebus or aide-memoire, it is not clear what meaning the dragon is supposed to portray.
机译:研究中世纪的Astrolabes的许多乐趣之一是,他们保留的明星指针通常是灾难性的。 特别地,其外框架的两端(霍布尼诺圈)有时是作为龙的头部和尾部的形式 - 见图1。1例。 虽然使用狗头作为狗星级Sirius(αcma,Alhabor)的指针,但是鹰一个Altair(αaql)或raven corvus(γCrv,algorab)的鸟类显然是作为rebus的形式或 助手备忘录,目前尚不清楚龙应该描绘的含义是什么意思。

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