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    Re: Howland Island landfall
    From: David C
    Date: 2017 Dec 22, 12:09 -0800

    Gary wrote

    Your hc is wrong. I just worked it on my calculator and got 49-07 which is what the US Naval Observatory says. Also, how do you convert a Z  of S53W to a Zn of 231?

    Clearly I have failed the practical test for my first class flight navigator's  licence (-;
    I have attached my very untidy work sheet. You will note that I originally calclulated Hc = 49° 6.5'  and then changed it to 65° 45.9'. My calculator is the fx-82AU which saves constants  when the calculator is turned off. However formulas are not saved. I am guessing that when I decided to check the result I entered the formula incorrectly.
    S53W is a typo. It should be S51W. I was confusing two calculations.
    UTC  0200   Z = S51W
    UTX 0205    Z = S53W
    You will also note that I was unsure if the sun was E or W of Howland Island. I solved  that problem by opening an app that shows the position of the Sun on a map of the world.
    Very sloppy work...........


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