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    Re: sight reduction tables
    From: Doug Royer
    Date: 2007 Sep 28, 15:52 -0700

    
    
    How does HO allow, for its named stars, for the slow drift in star 
    position caused by precession? Is there some way provided of correcting
    for 
    this drift, year on year? Or is Vol 1 of HO249 reissued after a period,
    when 
    precession starts to put star positions unacceptably far out?
    
    In the opening pages of Vol #1, HO 249 there is correction instructions
    for nutation and procession. Each printing of Vol 1, HO 249 is only
    really meant to be used for 5 years from the print date.
    
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