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    Re: Sumner Line of position
    From: Peter Hakel
    Date: 2009 Nov 18, 20:00 -0800
    Both the Van Allen and John Karl/Gauss method yield the same LOP intersections:

    Lat: 41 deg 59.5' N
    Lon 30 deg 00.3' W

    Lat: 11 deg 59.2' S
    Lon: 85 deg 09.5' E

    Based on the DR, the first solution is the actual fix; it agrees with the plot attached to the original posting.


    Peter Hakel



    From: "waldendand{at}YAHOO.COM" <waldendand{at}YAHOO.COM>
    To: NavList@fer3.com
    Sent: Wed, November 18, 2009 5:17:36 PM
    Subject: Re: [NavList 10739] Sumner Line of position

    Log Sumner

    Here's two Sumner lines using logs.  (Those given by Andres Ruiz.)  A few minutes with the Noire tables was all that was needed.  Each line takes two calcs, about the same as an altitude and an azimuth.  This case was for the body E-W, so a Latitude was assumed, and a Longitude calculated.  For bodies N-S, a Longitude should be assumed, and a Latitude calculated.  (Calculate using logs.  Left as an exercise for the reader.)

    **************************

    TWO Circles of Position
    19/02/2004  20:00:00 Fix
    UT1 date body GHA Dec Ho
    19/02/2004 20:00:00 Procyon 334.23  5.22 28.5
    19/02/2004 20:00:00 Sirius  347.78 -16.72 19.55
    DR at tFix: 42N 30.5W


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