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    Re: A key to the sketch map in "The geographical Lore..." of J.K. Wright (p. 245)
    From: Vladimir Uvarov
    Date: 2010 May 13, 23:39 -0700

    Thank you for information.

    According to the map in "The geographical Lore..." (p. 245) the longitude of
    Alexandria is 51;20 and the longitude of Alcufa is 69;30. The difference is
    69;30-51;20=18;10.
    In his work related to geodesy Abu Rayhan Biruni gives the following longitude
    differences:
    Alexandria-Raqqa = 11;45,15
    Raqqa-Baghdad = 6;20,43
    The sum is 18;05,58 approx. 18;10.

    So, according to al-Biruni Alcufa is probably Baghdad

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