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Monks Using Astronomical Instruments

The manuscript Ambrosiana H 57 sup. includes two texts on the astrolabe, Philoponus’s as well as an anonymous one from perhaps the late 13th century (though this copy is dated 14th century). Along with these texts are a couple Ptolemaic works and Theon of Alexandria’s “Commentarium paruum in Ptolemaei canones.” The manuscript itself is lovely […]

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Research

Byzantine Tables of Planetary Hours

The tradition of planetary hours established a ruling planet for each hour of each day. The first hour of the day was ruled by the planet that also gave the day its name, e.g., the sun ruled the first hour of Sunday. Each subsequent hour was ruled by the next planet in the series: Saturn, […]