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    Old style lunar
    From: Ken Muldrew
    Date: 2004 Dec 8, 21:21 -0700

    Earlier in the week, Alex wrote:
    
    > Can you send me (or post) specific numbers and details?
    > I mean what was the actual distance, GMT and your coordinates,
    > what was your
    > measured
    > distance, IC, what sextant did you use etc.
    >
    > (I am not only interested for the purpose of this discussion
    > but I also want to compare my own results with other people's
    > results).
    
    I've copied my notes from a lunar that I did in the spring. It is actually more
    tedious and time consuming to type this stuff in than it is to work the lunar
    the old fashioned way with pencil and paper. It's not really like an old-style
    lunar since my watch was set to zone time and I knew where I was. I did a
    few of these using my own data (and some more using historical data) to
    learn what was involved (the mechanics of the process). I became very busy
    with several things at the start of summer so the few lunars I've shot since
    spring have only been reduced briefly by computer; sometimes I just plot the
    data to have a look (and sometimes I just leave the numbers in my
    notebook). Below I take a time sight and 2 lunars. The lunars are worked
    using Witchell's method.
    
    Alex, it would be hard to notate this without writing a chapter on the subject,
    but please feel free to ask any questions you might have.
    
    Lunar - May 1, 04
    
    T = 12?C
    IE = 8.4' Regulus
    
    Regulus to )) NL
    time            dist
    10:06:35        36?18.5'
       08:00           19.4'
       08:50           19.9'
       09:40           20.1'
       10:55           20.4'
    -------------------------
         260            114
         175             60
         125             30
          75             18
           0              0
       ------        -------
        1270            444
    --------------------------
    10:08:48        36?19'40"
    
    Pollux to )) NL
    10:13:50        72?46.2'
       15:05           46.9'
       16:15           47.3'
       17:15           48.0'
       18:15           48.8'
    -------------------------
         265            156
         190            114
         120             90
          60             48
           0              0
       ------        -------
        1270            816
    --------------------------
    10:16:08        72?47'26"
    
    Venus altitude
    10:22:34        41?18.0'
       24:58        40?51.8'
       25:09           31.9'
       26:17           10.5'
       27:55        39?42.2'
    -------------------------
         321           95.8
         237           69.6
         166           49.7
          98           28.3
           0            0.0
       ------        -------
        1644          486.8
    -------------------------
    10:25:11        40?30'53"
                      - 8.4'
                    ---------
                    40?22'29"
                          /2
                    ---------
                    20?11'15"
    refraction = -2.6'
    Ho = 20?8.7'
    
    Almanac data for 10:25:11 MDT, 04:25:11 GMT (May 2)
    Venus decl      27?46.3'
    Polar dist      62?13'41"
    
    Time sight:
    Latitude        51?05'00"
    Ho              20?08'42"
    1/2 lat + Ho    35?36'50"  ctn  10.14491
                   -----------
    difference      15?28'08"  tan   9.44207
    1/2 PD          31?06'50"  ctn  10.21927
                                    --------
                    32?37'19" 
       
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