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    Re: Lunars -Venus!
    From: Ken Muldrew
    Date: 2004 Apr 23, 22:35 -0600

    Last night the moon was in a cloud by the time I got out, but I did get it on
    Wednesday. I'm at latitude 51? 5'N and 114? 0.5'W.
    
    Index error 8.3' on the arc.
    
    Venus to the moon's lower limb
    GMT     Distance
    3:13:10 15?58.2'
    3:11:50 15?57.3'
    3:13:10 15?57.0'
    3:14:30 15?56.0'
    3:15:20 15?56.2'
    
    GMT is for Apr 22, the time was 9:mm:ss local time.
    
    Sticking this into Arthur Pearson's webpage gave me a suprising -0.9'
    error.
    
    I also did Jupiter to the moon's LL
    
    GMT     Distance
    3:17:10 99?7.8'
    3:20:50 99?6.5'
    3:21:10 99?6.2'
    3:22:30 99?4.2'
    3:24:20 99?4.0'
    3:26:00 99?3.4'
    
    This was also a surprising -1.4' error in observation (substantially more
    in longitude).
    
    Earlier in the day I tried getting a latitude from double altitudes of the
    sun. The artificial horizon that I built has a hood that has a bit of a lip in
    front of the pan. With the sun so low, I couldn't get a reflection with the
    hood on so I had to remove it. It was quite windy, so I had no chance of
    seeing one of the reflected limbs. Instead, I just tried to bring the sun
    over the centroid of the dancing green blob that was reflected off the
    water. I only took a single reading at each time since it took about 5-10
    minutes just for that. At 5:54 PM local time (11:54PM GMT) I got a
    reading of 50?37.4' for an altitude of 25?12.5' (same index error). At
    6:49:50PM I got a reading of 33?16.1' for an altitude of 16?35.1'.
    Reducing this to a latitude gave me 51? 24' 41". Considering the
    appalling accuracy of my readings, I was very surprised with the
    accuracy of the result. Altitudes are certainly a lot more forgiving than
    lunars!
    
    Ken Muldrew.
    
    
    

       
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