Categories
Research

Byzantine Astrolabe (sort of)

In a fragment on the astrolabe attributed to John Kamateros are a handful of interesting diagrams illustrating the various parts of an astrolabe. Here is the diagram showing the rete. There is also diagram illustrating the plate, and two showing different views of the back of the instrument.

Categories
Academia

The Earth’s Shadow

Today’s image comes once again from the many diagrams in BL Royal MS 16 C XII. This particular drawing illustrates how the earth’s shadow is cast by the sun. I appreciate the detail the scribe added to the sun, giving it a face complete with attitude.

Categories
History

Interesting Planetary Diagram

The standard geocentric model assumed that the planets were arranged out from the center, the earth, according to the period of revolution. On this assumption, the shorter the period, the closer the planet was to the stationary, central Earth.[1] Claudius Ptolemy ensconced the order in his Syntaxis (commonly know as his Almagest) sometime in the […]

Categories
Museums

The Byzantine Astrolabe

I can’t reconstruct how I came across this page, but now that I have I can’t let it go without some comment. A search for the pair of terms “Brescia astrolabe” or “Byzantine astrolabe” gives as the second result a link to a Wikimedia page, Byzantine astrolabe at Brescia, 5th century AD (reconstruction).jpg A quick […]

Categories
Research

Filed under “Amusing Diversion”

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 […]

Categories
History

More Ὁ Καρπός Fun

Here is the next group of ten aphorisms, 21–30, from the copy of Ptolemy’s Ὁ Καρπός in BNF gr. 2180. Idiosyncrasies continue to be the norm. As is common in this text, along with the orthographic tendency to reflect pronunciation, these aphorisms often lack words and include numerous errors (usually in grammatical case). Interestingly, the […]

Categories
History

Aphorisms 11–20 from Ptolemy’s Ὁ Καρπός

Here are aphorisms 11–20 from the copy of Ptolemy’s “Ὁ Καρπός” in BnF gr. 2180. As to be expected, there are a number of idiosyncrasies here, some going well beyond the orthographic changes (which are unsurprising really). In some cases, this copy of the text includes additional clauses that raise interesting questions. For example, the […]

Categories
History

ὁ Καρπός, Aphorisms 6 – 10

As our reader continued to work through Ptolemy’s Ὁ Καρπός he either was uninterested in the minor errors in the Greek or didn’t notice them (such as the τοῦ γενεθλίω which clearly should be τοῦ γενεθλίου). He did add a couple corrections, particularly when whole words were missing. And he continued adding Latin translations for […]

Categories
History

Aphorisms 4 and 5 from Ptolemy’s Ὁ Καρπός

Let’s follow our reader through a couple more aphorisms from Ptolemy’s Ὁ Καρπός. Again he glosses most of the Greek with Latin translations and, once again, corrects a couple scribal errors by writing the correct Greek word above the mistake (though he seems to miss a couple other mistakes). And here’s a transcription of these […]

Categories
History

More fun with Ptolemy’s Ὁ Καρπός

Our premodern reader didn’t just add Latin glosses to his copy of Ptolemy’s Ὁ Καρπός, now and then he emended the Greek. For example, on the second aphorism the copiest wrote “τὴν κρεῖττον”. The reader seems to have been sufficiently bothered by this mistake that he wrote the correct article, “τὸ,” above the incorrect “τὴν.” […]