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    Newbie Question - Parallel LOPs
    From: Mark Waters
    Date: 2009 Jan 28, 00:08 -0800

    I've recently taught myself Celestial Navigation from library books
    but I still have some newbie questions. I thought I was doing fairly
    well using an artificial horizon - accuracy to within 6NM last week -
    but today after taking sun sights at 10.00 and 14.00 all my LOPs ran
    parallel. I reduced 8 different sights and double checked everything
    but the same result. I had read that a 4 hour spread would be enough
    but today my LHAs and Zn's all came out similar. My DR Long is 121W. I
    can only deduce that taking sights of the sun at a similar altitude at
    10.00 and 14.00 caused the LHA to be too close despite 4 hours time
    difference? Is this correct and will this always occur taking sights
    at this time if not moving? Excuse the naivety but like I said I am
    still a beginner.
    Many thanks,
    Mark
    
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