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    Re: Out of Date Almanac
    From: Frank Reed
    Date: 2009 Dec 7, 18:27 -0800

    Greg, you wrote:
    "my plan is to use a 2006 for the upcoming year 2010."
    
    You can use a four-year-old Nautical Almanac for the Sun and stars with only 
    small errors. For the Sun, the errors are only a couple of tenths of a minute 
    of arc. For the stars, unless you apply parallax corrections (and then what's 
    the point? might as well get a new one), the errors can be as large as 1.5 
    minutes of arc but typically less. It's no good for the Moon and planets, of 
    course. The other almanac tables for interpolation, refraction, site 
    planning, etc. do not change from year to year, so it's certainly worth 
    grabbing an old one for those.
    
    Another option for the "ephemeral" data would be to print out the pages you 
    need from an online nautical almanac. There's mine: 
    http://www.historicalatlas.com/lunars/nadata_v5.html 
    and there's one by Omar Reis:
    http://www.tecepe.com.br/scripts/AlmanacPagesISAPI.isa
    which is formatted just like the official Nautical Almanac.
    
    -FER
    
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