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    Re: FW: Re: Chronometer Suggestions
    From: Nicolàs de Hilster
    Date: 2009 Jan 15, 09:17 +0100

    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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