Article ID: CBB001251103

Investigations of the coordinates in Ptolemy's Geographike Hyphegesis Book 8 (2012)

unapi

In Book 8 of his Geographike Hyphegesis Ptolemy gives coordinates for ca. 360 so-called noteworthy cities. These coordinates are the time difference to Alexandria, the length of the longest day, and partly the ecliptic distance from the summer solstice. The supposable original conversions between the coordinates in Book 8 and the geographical coordinates in the location catalogue of Books 2--7 including the underlying parameters and tabulations are here reconstructed. The results document the differences between the W - and X -recension. The known difference in the longitude of Alexandria underlying the conversion of the longitudes is examined more closely. For the ecliptic distances from the summer solstice of the W -recension, it is revealed that they were originally computed by means of a so far undiscovered approximate, linear conversion. Further it is shown that the lengths of the longest day could be based on a linear interpolation of the data in the Mathematike Syntaxis 2.6.

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Authors & Contributors
Mozaffari, S. Mohammad
Christianidis, Jean P.
Morrison, Leslie V.
Hohenkerk, Catherine Y.
Thomaidis, Yannis
Temkin, Owsei
Concepts
Astronomy
Manuscripts
Arab/Islamic world, civilization and culture
Mathematics
Medicine
Longitude and latitude
Time Periods
Ancient
Medieval
4th century
Renaissance
3rd century
15th century
Places
Alexandria (Egypt)
Rome (Italy)
Greece
Rhodes (Greece)
Middle and Near East
Hellenistic world
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