As much as I like the connection to the ship and the instrument, I regret that the owners have been mislead by a common myth about astrolabes being used as navigational instruments. Astrolabes were never navigational instruments. Yes, they could be used to determine elevation of celestial objects (as well as doing a whole host of calculations), but they (at least the type of astrolabe pictured) were never used to navigate.
Whatever the case, references to astrolabes are turning up more often in popular culture (even GoT jumped on the “astrolabe” bandwagon). Before long we are likely to see Astrolabe return the lists of popular baby names. Abelard and Héloïse were just a few centuries ahead of their time.
Yes, the “Mariner’s astrolabe” was used to determine the elevation of celestial objects and thereby help to determine location. But that’s a different instrument. And while some people will argue that they are similar enough to allow for the slippage from one term to another, I am not such a person. Moreover, I would argue against the validity of claiming that one was subset of the other. And because this is my little sandbox, I get to be as pedantic and particular as I wish. ↩
A quick point: this astrolabe is not a reconstruction of a “5th-century” astrolabe. The Byzantine astrolabe now in City Museum in Brescia is from the 11th century. It’s dated 1062, to be precise.
I wonder: the user who uploaded the image claims it was taken at The Technology Museum in Thessaloniki. Did the museum mislabel this display? Did the Wikimedia user misread/mislabel the file? I could not find a page for this astrolabe (I assume it is part of the Ancient Greek Technology) so I can’t determine if the museum is to blame here. The Wikimedia user claims to be a native Greek speaker, so misreading the label might surprise me. But who knows.
In any case, if want to know more about the Brescia astrolabe you should download David King’s thoughts on this astrolabe, Byzantine Astrolabe of 1062. Or read O.M. Dalton’s old but still very reliable essay, The Byzantine Astrolabe at Brescia (1926). Regrettably, there are no high-resolution images of it on the internet, so you’ll just have to travel to Brescia to see it. In the mean time, here is (a copy) of the image from Dalton’s essay.
Working through a manuscript I came across this folio with a large diagram of the zodiac in the center.
What caught my attention was the drawing in the upper right corner. The scribe seems to have thrown his arms up in confusion (?), exasperation (?), or simply resignation. Either that, or he’s being held up at spearpoint. I don’t know what prompted the scribe to draw this figure, but I am amusing myself thinking through different scenarios.
I sympathize with his plight (ok, not the being held up at spearpoint bit).