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    Re: Reply to George Huxtable and other interested folks
    From: Mike Burkes
    Date: 2003 Jul 25, 18:21 -0700

    Sorry for the non conforming data presentation vs formal  sight reduction
    forms! I am fairly new at this computer stuff. Any questions my phone
    no:626-833-1521 anytime and email:m_burkes---.com. Mike Burkes
    
    
    >From: MIKE BURKES 
    >Reply-To: Navigation Mailing List 
    >To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    >Subject: Reply to George Huxtable
    >Date: Fri, 25 Jul 2003 17:57:02 -0700
    >
    >Hi folks and particularly to George who is anything but " particularly slow
    >and/or stupid!!" I will answer his questions the best I can. A "pinwheel
    >fix" refers to the ideal situation of the LOPS intersecting at one point
    >taking the name from the toy i.e. a plastic star -shaped wheel pinned to
    >rotate at end of stick by wind power. My "fix":34 24.8N, 119 01.5W vs
    >www.Geocode.com:34 28' 25.36"N,118 40' 05.23"w. Bodies were Sun,Moon,Vega.
    >Data: All dates and times G reenwhich,IC =0,Dip not applicable because of
    >artificial horizon, HO 249 for sight reduction. Sun LL:2Hs=97d 48.3m, July
    >04,2003, GMT 17-00-09, assumed L=34dN,aLong=118d 56.7W. Moon LL no.1:
    >2Hs=59d 48.9, July 05, GMT 04-23-10, aL=34dN,aLong=118d 38.1W. Moon LL
    >no.2:
    >2Hs=92 d49.8m, July 07, GMT 03-27-54 aL=34dN.aLong=119d 21.3W. Vega: 2Hs:
    >103d 40.1m,July 07, GMT 04-23-04,aL=34dN,aLong=119d00.0W. My resulting
    >fix:34d 24.8N, 119d 01.5W. Sun is Lunar Dist. body. Data: Four obs: GMT
    >20-53-15, 20-58-35, 21-02-40, 21-03-30, corresponding Ds: 61d 32.2m, 61
    >34.3, 61 36.0, 61 36.3. AP for Hc"s: 34d 24.0N, 119d 02.0W. Sun Hc=74d
    >36.5m,Moon Hc= 37d 30..5m. C.E.Fast 12m 25s,July 04, cleared dist"D" as per
    >Stark book=61d 23.0m resulting in GMT error of 00m 07s.
    >Reason for cocktail? Insufficient quanty of baby oil i.e. bath oil used to
    >make up difference in tray! Reflections at certain points of tray were
    >distorted.
    >
    >>From: George Huxtable 
    >>Reply-To: Navigation Mailing List 
    >>To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    >>Subject: Trying to understand- was "urgent help needed"
    >>Date: Fri, 25 Jul 2003 07:21:18 +0100
    >>
    >>Under the thread name "urgent help needed", (which seemed inappropriate,
    >>so
    >>I've changed it). Mike Burkes said-
    >>
    >> >Hi folks! An interesting observational situation occurred as follows:
    >>Using
    >> >Davis Artificial Horizon sites appeared ok i.e. graphing 2Hs vs. time on
    >>all
    >> >sites resulted in a near classic "pinwheel fix".However comparing "fix"
    >>to
    >> >map the results were off. Using my"fix" for Hc computations lunar
    >>distance
    >> >GMT differed by a mere few seconds indicating the flexibility of assumed
    >> >position choice. I feel the reason for the discrepancy stems from the
    >> >artificial horizon fluid being a combination of baby and bath oil
    >> >introducing a constant error.I did notice several aberrations while
    >>scanning
    >> >the pool. Any feedback would be greatly appreciated! Thanks! Mike Burkes
    >>
    >>
    >>I may be particularly slow, or stupid, but I understood very little about
    >>Mike's observations. What's a "pinwheel fix"? When he says comparing "fix"
    >>to map the results were off; how much off?
    >>
    >>He hasn't given us a single number to go on. What bodies was he observing
    >>sights of? From where? When? What were the resulting altitudes? What was
    >>the calculated position? What body was used with the Moon for lunar
    >>distance? What was the resulting distance?
    >>
    >>Only if we get some details to get our teeth into can we hope to respond
    >>to
    >>Mike's request for feedback. That's as I see it, anyway: it may be clearer
    >>to others, with sharper minds.
    >>
    >>I've never had much use for bath oil (or baby oil either, happy to
    >>say...).
    >>Do they mix? What was the intention behind this cocktail? If an oily
    >>substance is being chosen for an artificial horizon, it seems sensible to
    >>choose something really viscous or treacly, because wind won't ruffle its
    >>surface noticeably. Does Mike's blend of oils meet that requirement?
    >>
    >>George Huxtable.
    >>
    >>================================================================
    >>contact George Huxtable by email at george---.u-net.com, by phone at
    >>01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    >>Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    >>================================================================
    >
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