The African Cush covers Upper Egypt, and extends southwards from the first cataract (Syene, Ezek.
He crossed Arabia from Bahrein to Jidda, traversed the Red sea and the desert to Syene, and descended the Nile to Cairo.
The great bronze head of Augustus Caesar, now in the British Museum, is one of the trophies of this excavation, and is very interesting as being either a trophy of war carried off perhaps from Syene, or was actually set up at Meroe by the independent native ruler in honour of the Emperor.
It was upon a map based upon such a source that Eratosthenes (276-196 B.C.) measured the distance between Syene and Alexandria which he required for his determination of the length of a degree.
It should be noted that he places Syene only two degrees to the east of Alexandria instead of three degrees, the actual meridian distance between the two places; a difference which would result from an error of only 7° is the orientation of the map used by Ptolemy.
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