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HoS Advent Calendar 2016

Nicephorus Gregoras’s “περὶ κατασκευῆς … ἀστρολάβου”

A nice drawing of the rete from Nicephorus Gregoras’s “περὶ κατασκευῆς καὶ γενέσεως ἀστρολάβου” (“On the Mathematical Origin and Construction of the Astrolabe”). This rete, like other diagrams in copies of Gregoras’s text, lacks stars and finer details. In the few copies I’ve seen that include the stars, the rete closely resembles the one surviving […]

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HoS Advent Calendar 2016

Another Byzantine Wind Diagram

This Byzantine wind diagram, also titled “Diagram about thunder, storms, rainstorms, and earthquakes,” closely resembles the previous Byzantine Wind Diagram. Both come from latter 16th-century manuscripts. This particular copy was never finished—the elements are missing from the center of the diagram, the “παναχῆ” is also missing in this copy.[1] Once again, we see the aspects […]

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Research

Images of Byzantium: Nicephorus Gregoras’s “On the Construction and Origin of the Astrolabe”

In 1498 Giorgio Valla published a Latin excerpt from Nicephorus Gregoras’s treatise “On the Construction and Origin of the Astrolabe.” Despite appearing as the fifth tract in Valla’s compendium, which included other Byzantine and Greek authors, Gregoras’s text quickly became a standard authority amongst scholars in 16th-century Europe. Authors such as Johannes Schöner and Peter […]

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Research

Nikephoros Gregoras and Byzantine Science

In March I am talking on the Byzantine polymath Nikephoros Gregoras and his efforts to establish his scientific authority. In “Empiricism, Prediction, and Instruments: The Creation of Expertise in 14th-Century Constantinople” I will examine the ways that Gregoras tried to distinguish his own expertise by grounding it in precise, empirical predictions and his command of […]