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    Re: New compact backup CELNAV system
    From: Nicol�s de Hilster
    Date: 2009 Mar 20, 20:23 +0100

    Andrew Nikitin (nsg21@hotmail.com) wrote:
    >> Date: Wed, Mar 18 2009 3:10 am
    >> From: "Andres Ruiz"  
    >> * Annual curve of the Sun's declination. For Latitude calculation. (pdf for
    >> 2009)
    > I would like to suggest an alternative to Sun's declination curve -- sun
    > declination scale (see attachment). It takes less space and shows sun
    > declination for 4 consequtive years, (2008-2011), but, I guess, it can be used
    > long term too.
    > The accuracy (~05') is not that great, but can be improved by splitting each
    > scale into 4 pieces instead of 2.
    > (At this stage scale needs work close to the ends. I have'nt figured out how to
    > make it look good. Suggestions?)
    Nice scales Andrew, a four year almanac on one page! Splitting the 
    scales is indeed a good way to get more accurate readings.  You could 
    easily place the two scales that form a year closer to each other as 
    well, so there will be enough space on one sheet for split scales. I 
    think your estimate of 5 arc minutes is a bit on the low side, at this 
    moment it is already possible to read them down to about 2 arc minutes.
    For the ends I would suggest that you decrease the date intervals, so 
    simply skip the day markers between 10 June (or 15 June) and 21 June, 
    only keeping the 5 day markers in place. In this way the ends will look 
    less crowded while it will hardly negatively influence the readings.
    If these scales are intended for use on screen only, you could also 
    print them to an A3 or larger pdf file. In this way the screen 
    resolution will increase significantly. I do the same when I have to 
    submit CAD drawings to clients and it works really neat.
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