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    Re: FW: Re: Chronometer Suggestions
    From: Gary LaPook
    Date: 2009 Jan 15, 00:24 -0800
    Cool.


    gl

    --- On Thu, 1/15/09, Nicolàs de Hilster <groups{at}dehilster.info> wrote:
    From: Nicolàs de Hilster <groups{at}dehilster.info>
    Subject: [NavList 7061] Re: FW: [NavList 6952] Re: Chronometer Suggestions
    To: NavList@fer3.com
    Date: Thursday, January 15, 2009, 12:17 AM

    On NavList 7052 Irv Haworth wrote:
    > "I think it's well known that 1' of arc varies in length as a
    function
    > (cos)
    > of the latitude."
    >
    >
    On which Gary LaPook replied in NavList 7053:
    > That is true for one minute of longitude because parallels of latitude are
    small circles.
    > This is not true for one minute latitude of for any
    > other great circle. (Technically these also vary slightly due to the
    > oblateness of the earth but these small variations are ignored for
    > celestial navigation purposes.)
    >
    For those who want to know how much exactly that variation is I posted
    attached graph of it in NavList 4750 on 24/03/2008.





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