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    Re: Moonrise video
    From: Gary LaPook
    Date: 2013 Apr 30, 08:47 -0700
    Mr. van Asten, your oddball ideas concerning celestial navigation may work on the TIGHAR forum and other Earhart discussion groups for lay people but it will get you nowhere on this website which is peopled by navigators knowledgeable of celestial navigation.

    gl
    --- On Tue, 4/30/13, h.a.c. van Asten <hac.vanasten---.com> wrote:

    From: h.a.c. van Asten <hac.vanasten---.com>
    Subject: [NavList] Re: Moonrise video
    To: garylapook---.net
    Date: Tuesday, April 30, 2013, 6:01 AM


    Any ex-marine air navigator of the era certainly knew about the for the sun zero altitude refraction , then figured 37 arcminutes . Be it not from H.O.208 or other tables , every textbook and the nautical almanacs contained chapters on the subject . Conyers Nesbit , professional navigator , in articles (*) and a book refers to mr.Noonan´s supposed ability to derive a more or less accurate geographical position from observing sunset and sunrise . It is not even necessary to observe for the instant : if the time-position group is precomputed and sunset-sunrise superficially observed from an aircraft , one acquires an indication for being with acceptable uncertainty in the vicinity of the precomputed coordinates pair . Mr.Noonan may have used this fashion when near Nukumanu Island he announced his position at 0718 GMT (mr.Chater´s watch time) , whereas actual sunset was at 0719:30 GMT , as mentioned in the addenda on EJN articles of July 2008 and April 2011 . We do not know it by certainty , but he may have also used it for sunrise in the roads of Howland .

    (*) Aeroplane Monthly , Jan and Feb , 1989 .
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