Facsimile of LJS 487, Treatises on astronomical instruments
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Astronomy--Early works to 1800
Astronomical instruments--Early works to 1800
Sundials--Early works to 1800
Time measurements--Early works to 1800 Codices
Treatises
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Manuscripts Latin--16th century
Manuscripts Renaissance
Astronomical instruments--Early works to 1800
Sundials--Early works to 1800
Time measurements--Early works to 1800 Codices
Treatises
Tables (documents)
Manuscripts Latin--16th century
Manuscripts Renaissance
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2015-09-13
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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.