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    Re: Obtain a fix when you don't have an clear AP?
    From: Stan K
    Date: 2015 Jan 9, 17:04 -0500
    Where can I find the correct answer?  Using Celestial Tools iteratively, I get 47º29.0'N, 122º13.9'W.  8055 S Langston Rd, Seattle, WA.


    -----Original Message-----
    From: Samuel L <NoReply_SamuelL@fer3.com>
    To: slk1000 <slk1000@aol.com>
    Sent: Fri, Jan 9, 2015 2:26 am
    Subject: [NavList] Obtain a fix when you don't have an clear AP?

    There's a youtube video of a man taking 2 Sun sights and asking you to figure out where he's located. Greg got it correct (as you can read in the comments section of the video) using, I assume, his Palm (Pilot?) with Pilot Navigator Version 6.9.
    The time WWV signals are very heard hear and the guy makes little effort to provide you with time or Hs- in other words his presentation is  sloppy.
    What I'm trying to figure out is how you get a position fix when you don't have an obvious Ap Latitude or Ap Longitude? And, I can't plot an intercept that's many hundreds of miles away on a UPS. However, I did figure out the time and Hs of both sights and using Peter Hakel's Lop.xls a fix was obtained. But I'd like to know how to do it on paper either by adjusting the Ap Longitude and resulting LHA which I suppose is the only thing you can adjust. I'm no expert in these matters.
    An AH was used in both shots.
    Here are the particulars from the video-
    1rst shot Date- 2/20/2010
    Time- 17:26:26 UTC
    Hs- 40d 18.2min
    Limb observed- Upper Limb
    My determinations-
    GHA 78d 11min
    Declination- S 10d 46.4min
    Ho- 19d 50.5min
     
    2nd shot Date- 2/21/2010
    Time- 00:16:02 UTC
    Hs- 24d 04.4 min
    Limb observed- Lower Limb
    My determinations-
    GHA 180d 35.5min
    Declination- S 10d 40.3min
    Ho- 12d 14.1min
    Using Peter Hakel's LOP.xls the following fix was obtained-
    N 47d 28.8min
    W 122d 13.9min
     
    Thanks,
    Sam L.
       
    Reply
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