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    Re: A noon sight conundrum
    From: Peter Fogg
    Date: 2003 Dec 2, 11:01 +1100

    > > 3) In your learned opinion what was the time of meridian passage on that
    day
    > > at long 132d 40' E.
    > >
    >
    > 3:15:39 GMT
    
    Earlier I had found a slightly different time. On checking I found that I
    had used the data from 2003 instead of the year before, which prompted the
    question : what changes the sun's position slightly year to year? One
    possible answer is that our convention of adding a day every 4 years doesn't
    exactly account for the time it takes the earth to orbit the sun. Are there
    others?
    
    Another thing I noticed is that on the day in question, Sat 20 Jul 2002, the
    v correction is zero, and that with the sun it never becomes a big figure,
    unlike the moon, for example.
    
    I guess that all of this is fairly elementary astronomy - would anyone like
    to have a go at shedding some light?
    
    
    

       
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