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    Re: Latitudes by lunar distance. was: Lunars with and without altitudes
    From: George Huxtable
    Date: 2006 Nov 28, 12:01 -0000

    Thanks to D Walden 
    for his response to my questions about his computer program,
     [NavList 1753] Re: Latitudes by lunar distance. was: Lunars with and
    without altitudes
    He has correctly understood each of my questions, and given a full
    response which has cleared it all up. End of dialogue. A simple and
    civilised exchange, between us.
    I had written, in [Navlist 1751]
    "But there are other details, that need to be thought about, when such
    great precision is being sought."
    And Frank Reed, in [[NavList 1760], has seen fit to make this somewhat
    peevish intervention-
    "George, you then went on to discuss various small points about the
    augmentation of the Moon, refraction formulas, and more. But none of
    this has anything to do specifically with this business of getting a
    position fix by lunar distances. Instead it's just basic material
    about clearing lunars that should be well-known to anyone messing
    around with lunars. Surely, when you were asking for further
    explanation on this topic, you were not asking how to calculate the
    Moon's augmentation, were you??"
    I really can't fathom what all that was about, except that somehow
    Frank has got upset by it.
    The "other details", that I asked about, were VERY relevant to the
    business of seeking ultimate precision in the clearing of lunar
    distance. And because of the unfamiliarity (to me, and perhaps to
    others) of the notation that the program used, those details were not
    explicit to the reader. D Walden has kindly explained, and his
    explanation indeed shows that in two aspects (refraction and
    augmentation of semidiameter), some further development of the program
    could do a bit of good in achieving ultimate precision, if a wide
    range of possible sky-positions is to be catered for.
    And in response to Frank's question; no, I wasn't asking how to
    calculate the Moon's augmentation, as he would see if he read it
    again. I was suggesting that it should be taken into account, in the
    program. Any objection to that?
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com

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