Penn Library's Library's LJS 487 - [Treatises on astronomical instruments].(Video Orientation)
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Astronomy -- Early works to 1800, Astronomy, Astronomical instruments -- Early works to 1800, Sundials -- Early works to 1800, Sundials, Time measurements -- Early works to 1800, Time measurements, Astronomical instruments, Codices, Treatises, Tables (documents), Manuscripts Latin, Manuscripts Renaissance
Astrophysics and Astronomy | History of Science, Technology, and Medicine | Renaissance Studies
Porter, D. (2023, March 20). Penn Library's Library's LJS 487 - [Treatises on astronomical instruments].(Video Orientation). [Video file.] Retrieved from https://repository.upenn.edu/sims_video/223
Video Orientation to the University of Pennsylvania Library's LJS 487, an anonymous treatise on constructing and using a horologium diei et noctis (combined sun dial and nocturnal), perhaps missing its first leaf, with 4 small tables (f. 4v, 6r, 6v, 8r). The uses include telling time of day and night, determining the times of sunrise and sunset and the precession of equinoxes and solstices, and measuring the height of stars. The first pages of an incomplete treatise on constructing a instrument for measuring angles called a baculus Jacob (called cross-staff or Jacob's staff in English, arbalestrille in French) follow.
Written in eastern France in the 16th century, perhaps Franche-Comté or Lyonnais in the first half of the 16th century (based on script and watermarks).
Record on Franklin, with link to a digital copy: https://franklin.library.upenn.edu/catalog/FRANKLIN_9956428933503681
Record on Internet Archive, with a link to PDF: https://archive.org/details/ljs487