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    Re: I couldn't resist!
    From: Lu Abel
    Date: 2012 Oct 19, 10:51 -0700
    Right -- I should have added "took shot at sea" as one of the primary reasons.


    From: Apache Runner <apacherunner---.com>
    To: NavList@fer3.com
    Sent: Friday, October 19, 2012 10:37 AM
    Subject: [NavList] Re: I couldn't resist!

    I suspect more one of two plausible problems for Dias.   The Portuguese in that period had a modified astrolabe.   Rather than being filled up with a star finder and a projection of altitutde/azimuth coordinates, it had four cut-outs on it to limit wind buffeting.   Still, they got buffeted by the wind.   

    I don't know offhand whether Dias went ashore to take the sighting, but it's possible in my thinking that he might have taken it on ship-board, and the instrument got pushed around in the course of taking the shot, and he didn't notice this.   It was at a time when the techniques were still in their infancy.  

       
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