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    Re: Lunar eclipses and other things
    From: Alexandre Eremenko
    Date: 2004 Oct 26, 20:33 -0500

    Fear Lisa,
    I am glad you liked my little historical digression.
    On Wed, 27 Oct 2004, Lisa Fiene wrote:
    > Consider Hypatia of Alexandria (?350/379AD to 415AD)
    She was also one of the last Alexandria's mathematicians...
    She was lynched by the mob.
    Other remanining mathematicians were facing a choice:
    to quit their activities or to go to exile
    (6 of them went to exile, to Persia). The full scale
    Dark Age was beginning...
    > Most references agree that the actual origin (and inventor) of the
    > astrolabe is shrouded in mystery.  Ptolemy certainly discusses the
    > principles of stereographic projection 200 years earlier.
    I actually know very little about astrolabia.
    And its connection to streographic projection is new to me.
    Any references on this connection?

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