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Al-Battani: Kitab al-Zij al-Sabi (929)
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Taken from M. Tolmacheva: Ptolemaic influence on Medieval Arab Geography
He relied on Ptolemy for his geography; but the only place on the east-African coast mentioned is Al Tib.
The coordinates of Al Tib (Aromata of Ptolemy) are 82 deg and 4deg 30min North.
