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    Re: Read the vernier, get the noon latitude
    From: Gary LaPook
    Date: 2018 Feb 6, 21:04 +0000
    I used them1999 Nautical Almanac. If you used 2018 then the declination will be 23° 24.6' moving the latitude 0.4' further north at 39° 18.3''  North, also properly expressed as 39° 18'  North .

    gl



    From: Gary LaPook <NoReply_LaPook@fer3.com>
    To: garylapook---.net
    Sent: Tuesday, February 6, 2018 12:25 PM
    Subject: [NavList] Re: Read the vernier, get the noon latitude

    Hs        73° 54'
    IE                 0
    Dip         -   3.4'
    Ha         73° 50.6'
    Ref/Sd  +    15.7'
    Ho         74° 06.3'


                  89° 60.0'
               -  74° 06.3'
    ZD          15°  53.7'
    Decl        23° 24.2' North

    Lat          39° 17.9'  North 

    But since you started off with a sextant altitude only given to 1 minute precision then it is only valid to give the latitude to that same level of precision so the the correct answer is  39° 18' North. 


    gl
        
           





    From: Frank Reed <NoReply_FrankReed@fer3.com>
    To: garylapook---.net
    Sent: Tuesday, February 6, 2018 11:50 AM
    Subject: [NavList] Read the vernier, get the noon latitude

    Not the best photo but readable. What do you get for the altitude on this octant? 73° and...
    Assuming that it's the Sun's Noon altitude (almost certainly "LL"), and the GMT is about 17:00 (within an hour) and the date is June 18 (year indeterminate but after the invention of the digital camera), and height of eye is average for a medium-sized vessel, let's say 12 feet, and assuming that the observer's shadow was pointing north at noon, what is the latitude?
    Frank Reed


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