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    Re: Instumental error?
    From: Frank Reed
    Date: 2005 Apr 20, 23:23 EDT
    Bill wrote:
    "> If I recall, the specs
    > are plus/minus 10 seconds error along the arc (0.17').
    > Unless you got a
    > dud, any value higher than 0.2' is highly suspect.
    And Alex replied:
    "Yes, I'm afraid it is a dud."
     
    I don't buy it. That the certificate *says* the error is 10 seconds doesn't mean much of anything. Arc error is a correctable error and shooting lunars/star-star sights is probably the best way to detect it. Build your table, and then use it. And the fact that such error exists doesn't mean the instrument is a "dud". Correcting for arc error, once you have determined it, is every bit as easy as correcting for index error.
     
    -FER
    http://www.HistoricalAtlas.com/lunars
       
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