Bringing jointly the surviving fabric and manuscript proof, this booklet seems to be heavily at a desirable medieval sundial within the kind of a boat. It considers who made and used the surviving tools, in addition to learning the students who wrote approximately i
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Additional resources for Monks, Manuscripts and Sundials (History of Science and Medicine Library)
The longer versions found in RA and BL2 have been expanded to include material on telling the time in unequal hours, and on measuring heights and depths using the shadow square and unequal hours diagram on the back of the navicula. RA is less detailed than BL2, including only one section on measuring the height of a tower using the navicula. BL2 contains the most detailed treatment of the use of the navicula for measuring heights and depths. It includes sections on measuring the height of something, on measuring the height of something whose base is inaccessible, on measuring the depth of a well, and on measuring the size of an area.
24r. calendar tables and latitude lists 47 Carthage (37 0), Constantinople (43 40) and Damascus (33 0, two scribes). The latitude of Jerusalem is specified (32 0), as is that of Arin (0 0), a theoretical location from which measurements were taken by Arab geographers. 19 In common with the table shown above, the tables transcribed by North contain more than one value for some of the places, suggesting that as well as being a practical compilation, the table is a record of all the values the scribe could gather.
Under the Julian calendar, however, the dates on which the sun entered each sign changed gradually and tables like those above would become less accurate as time went on. Added to manuscript PH1, by a different scribe than the one who copied the navicula text, there is a table that was copied or written in 1513, and which shows different values:1 Aquarius January 10th Pisces February 9th Aries March 10th 1 Table on f. 96v. Leo Virgo Libra July 14th August 14th September 14th 40 chapter four Taurus Gemini Cancer April 11th May 12th June 12th Scorpio October 14th Sagittarius November 13th Capricorn December 12th There is, however, no evidence that naviculae were made with revised tables engraved on them.