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    Re: Lewis and Clark lunars: more 1803 Almanac data
    From: Ken Muldrew
    Date: 2004 Apr 17, 09:18 -0600

    First, let me apologize for not writing who I was quoting in my last
    message; it was Frank Reed. My reply is in this thread, but it isn't nested
    underneath the quoted message. Sorry all.
    
    > Frank Reed wrote:
    
    > For every half hour, starting at 0400 GMT on Dec 3, 1803, I find for
    > Aldebaran lunars (apparent center-to-center distances): 60.994 61.268
    > 61.522 61.761 61.987 62.200 62.403 62.597 62.785 62.966 63.143 63.314
    > 63.483 63.650 63.814 63.967
    
    From this data, we see an almost constant relative motion of the moon of
    25"/min over the period of 11:30PM to 1:30AM local time. Despite the
    scatter of the L&C data, they measure a relatively constant motion of
    18"/min over the same period. I really think that this indicates that they
    were measuring the wrong star, and that it was well wide of the moon's
    path.
    
    > ... I experimented with errors in
    > near limb versus far limb --even near limbs taken from the gibbous
    > side of the Moon. But still no luck... (there might still be a little
    > life in that idea though).
    
    This was my first thought because I recently made the very same error
    and only noticed when I plotted out my data (it looked a lot like L&C's
    2nd observation of Aldebaran, George's series C). But it's just too far off,
    and they had to be better at this than me.
    
    Ken Muldrew.
    
    
    

       
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