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Taken from: Horoscopes and history by John David North
Latitude 18;00 Longitude 086;00 Fragum
Note: this reminds us of Prasum by Ptolomy. (1)
The coordinates were used by Al Dimyati (12th century)
for al Zanj. (2)
(1) Prasum by Ptolomy: see my webpage Claudius Ptolemy (165).
(2) Al Dimyati (12th century): see my webpage Al Dimyati (12th century).