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    Re: lunars hard to shoot
    From: Nigel Gardner
    Date: 2000 Sep 14, 4:04 PM

    Use of back Sight
    
    In the 1805 edition of Norie's Epitome he says,
    
    [The back sight is used] '... when the observer's back is towards the
    object, and it is brought over to the opposite part of the Horizon, and is
    thence called a back observation. This latter method of observing is very
    seldom used and is required only when the Horizon under the object is
    broken by adjacent shores, or rendered indistinct by fogs or other
    impediments'
    I recollect reading somewhere that it could also be used say for Polaris
    when the Northern horizon was no longer visible but the Southern Horizon
    was still illuminated.
    
    Norie gives four different methods for finding the Lunar Distance but it
    requires the tabulated distances from the Almanac to find Longitude, which
    last included in 1907. The 1967 Nautical Almanac included them to mark its
    bicentenery.
    
    Nigel Gardner
    

       
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